I forgot to mention, yes I have cookies enabled in TB

With OAuth2 authentication you cannot use app passwords, you'll have to use your main Google account password. You should delete any app passwords Thunderbird has remembered.

i ... set both Imap.gmail.com and smpt.gmail.com to use OAuth2 (both set for SSL/TSL).

The server names are imap.gmail.com and smtp.gmail.com.

I have to hit cancel it then shows Failed message unable to authenticate.

Please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button , then select Help > Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

I wished thunderbird had check boxes on emails to select via checkboxes for delete, or moving, etc)

Thunderbird does have those check boxes. Just enable the Select Messages column in the thread pane.

Christ1 thanks for the reply, smpt.gmail.com was a typo only in the msg i sent to the board here, it was correct in the program I deleted passwords (for the gmail accounts, as you see, i have other accounts and they are all working correctly), i tried imap.gmail.com but got an error (after getting authorization from my cellphone) that it cannot connect to server. so i went back to imap.google.com and it doesn't see that error but, it doesn't download new msgs and when i go through authorizing on the phone the smtp.gmail.com it just says 'sending message...' but never sends anything, i have to hit cancel and it give authorization error. sending trouble shooting info in nxt email

Application Basics

   Name: Thunderbird
   Version: 91.7.0
   Build ID: 20220305171341
   Distribution ID:

   Update Channel: release
   User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0
   OS: Windows_NT 10.0 22000

   Launcher Process: Enabled
   Multiprocess Windows: 0/0
   Fission Windows: 0/0
             Disabled by default
   Remote Processes: 4
   Enterprise Policies: Inactive
   Google Location Service Key: Missing
   Google Safebrowsing Key: Missing
   Mozilla Location Service Key: Missing
   Safe Mode: false

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) imap.googlemail.com:993, 3, 10
     OUTGOING: , smtp.gmail.com:465, 3, 10, true

   account2:
     INCOMING: account2, , (none) Local Folders, 0, 3

   account3:
     INCOMING: account3, , (imap) outlook.office365.com:993, 3, 3
     OUTGOING: , smtp.office365.com:587, 2, 3, true

   account4:
     INCOMING: account4, , (imap) mail.supremecluster.com:143, 0, 3
     OUTGOING: , smtp.gmail.com:465, 3, 10, true

   account5:
     INCOMING: account5, , (imap) imap.gmail.com:993, 3, 10
     OUTGOING: , smtp.gmail.com:465, 3, 10, true

   account7:
     INCOMING: account7, , (imap) mail.supremecluster.com:993, 3, 3
     OUTGOING: , mail.supremecluster.com:465, 3, 3, true

   account8:
     INCOMING: account8, , (imap) outlook.office365.com:993, 3, 3
     OUTGOING: , smtp.office365.com:587, 2, 3, true

   account9:
     INCOMING: account9, , (imap) mail.supremecluster.com:993, 3, 3
     OUTGOING: , mail.supremecluster.com:465, 3, 3, true

 Calendar Settings

   Home

     Name
     Value

     Name:
     Type: storage
     Disabled: true
     Username:
     URI:
     Refresh Interval:
     Read-only:
     Suppress Alarms:
     Cache Enabled:
     iMIP Identity: id1
     iMIP Disabled:
     iMIP Account:
     Organizer Id:
     Force Email Scheduling:
     Popup Alarms Supported:
     Alarms on Invitation Supported:
     Max Alarms Per Event:
     Attachment Supported:
     Max Categories:
     Privacy State Supported:
     Priority Supported: true
     Event Supported:
     Task Supported:
     Local Time Supported:
     UTC/GMT Supported:
     Auto-Scheduling Supported:

 Crash Reports for the Last 3 Days

 Remote Processes

   Type: Count

     Web Content: 3 / 8
     GPU: 1

 Add-ons

     Name
     Type
     Version
     Enabled
     ID

       Amazon.com
       extension
       1.1
       true
       amazondotcom@search.mozilla.org

       Bing
       extension
       1.0
       true
       bing@search.mozilla.org

       DuckDuckGo
       extension
       1.0
       true
       ddg@search.mozilla.org

       Google
       extension
       1.0
       true
       google@search.mozilla.org

       Wikipedia (en)
       extension
       1.0
       true
       wikipedia@search.mozilla.org

 Security Software

   Type: Name

     Antivirus: Microsoft Defender Antivirus
     Antispyware:
     Firewall: Microsoft Firewall

 Graphics

     Features
     Compositing: WebRender
     Asynchronous Pan/Zoom: wheel input enabled; scrollbar drag enabled; keyboard enabled; autoscroll enabled; smooth pinch-zoom enabled
     WebGL 1 Driver WSI Info: EGL_VENDOR: Google Inc. (NVIDIA)

EGL_VERSION: 1.5 (ANGLE 2.1.15727 git hash: 23851a53779d) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_ANGLE_direct_composition EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_CHROMIUM_sync_control EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_display_semaphore_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled EGL_ANDROID_blob_cache EGL_ANDROID_recordable EGL_ANGLE_image_d3d11_texture EGL_ANGLE_create_context_backwards_compatible EGL_KHR_create_context_no_error EGL_KHR_reusable_sync EGL_EXTENSIONS(nullptr): EGL_EXT_client_extensions EGL_EXT_device_query EGL_EXT_platform_base EGL_EXT_platform_device EGL_ANGLE_platform_angle EGL_ANGLE_platform_angle_d3d EGL_ANGLE_platform_angle_d3d11on12 EGL_ANGLE_device_creation EGL_ANGLE_device_creation_d3d11 EGL_ANGLE_experimental_present_path EGL_KHR_client_get_all_proc_addresses EGL_KHR_debug EGL_ANGLE_explicit_context EGL_ANGLE_feature_control IsWebglOutOfProcessEnabled: 1

     WebGL 1 Driver Renderer: Google Inc. (NVIDIA) -- ANGLE (NVIDIA, NVIDIA GeForce RTX 3060 Laptop GPU Direct3D11 vs_5_0 ps_5_0, D3D11-30.0.15.1165)
     WebGL 1 Driver Version: OpenGL ES 2.0.0 (ANGLE 2.1.15727 git hash: 23851a53779d)
     WebGL 1 Driver Extensions: GL_ANGLE_base_vertex_base_instance GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_get_serialized_context_string GL_ANGLE_get_tex_level_parameter GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_memory_size GL_ANGLE_multi_draw GL_ANGLE_multiview_multisample GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_provoking_vertex GL_ANGLE_request_extension GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_lose_context GL_CHROMIUM_sync_query GL_EXT_EGL_image_external_wrap_modes GL_EXT_blend_func_extended GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_draw_elements_base_vertex GL_EXT_float_blend GL_EXT_frag_depth GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_multisampled_render_to_texture GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_bptc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_no_error GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_EAC_R11_signed_texture GL_OES_compressed_EAC_R11_unsigned_texture GL_OES_compressed_EAC_RG11_signed_texture GL_OES_compressed_EAC_RG11_unsigned_texture GL_OES_compressed_ETC2_RGB8_texture GL_OES_compressed_ETC2_RGBA8_texture GL_OES_compressed_ETC2_punchthroughA_RGBA8_texture GL_OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture GL_OES_compressed_ETC2_sRGB8_alpha8_texture GL_OES_compressed_ETC2_sRGB8_texture GL_OES_depth24 GL_OES_depth32 GL_OES_draw_elements_base_vertex GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_border_clamp GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_texture_stencil8 GL_OES_vertex_array_object GL_WEBGL_video_texture
     WebGL 1 Extensions: ANGLE_instanced_arrays EXT_blend_minmax EXT_color_buffer_half_float EXT_float_blend EXT_frag_depth EXT_shader_texture_lod EXT_sRGB EXT_texture_compression_bptc EXT_texture_compression_rgtc EXT_texture_filter_anisotropic MOZ_debug OES_element_index_uint OES_fbo_render_mipmap OES_standard_derivatives OES_texture_float OES_texture_float_linear OES_texture_half_float OES_texture_half_float_linear OES_vertex_array_object WEBGL_color_buffer_float WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_depth_texture WEBGL_draw_buffers WEBGL_lose_context
     WebGL 2 Driver WSI Info: EGL_VENDOR: Google Inc. (NVIDIA)

EGL_VERSION: 1.5 (ANGLE 2.1.15727 git hash: 23851a53779d) EGL_EXTENSIONS: EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle

Why do people think email settings is some sort of guess work or lottery. Google publish the settings. https://support.google.com/mail/answer/7126229?hl=en#zippy=%2Cstep-change-smtp-other-settings-in-your-email-client

I would however suggest you work through the entire list here https://support.google.com/mail/answer/7126229?hl=en#zippy= Using anything but the publishes settings is not going to be a long term solution. So use the settings google publishes. Anything else is just asking someone to help you chase your tail because what you are doing is not supported by google.

The Gmail authorization process is a series of web pages server by Google via the Thunderbird inbuilt browser. Once it is completed successfully then you should not be asked for a password and you should not get a message on your phone. Continuing to receive those messages indicates your setup is not complete.

You might want to go to this address https://accounts.google.com/b/0/DisplayUnlockCaptcha just to make sure Google has not locked your account from Thunderbird because of to many wrong passwords or something.

However I strongly suggest you post the troubleshooting information. because it looks from here like you have it all messed up really.

Matt, sorry, but you are being a bit too presumptuous and condensating in my view . I have been to https://support.google.com/mail/answer/7126229?hl=en#zippy=%2Cstep-change-smtp-other-settings-in-your-email-client and as far as i can tell, i have used the proper settings.

You said: "Once it is completed successfully then you should not be asked for a password and you should not get a message on your phone. Continuing to receive those messages indicates your setup is not complete."

Well, that last statement is obvious, something is not setup right, that's why i came here seeking help. I have been a computer programmer and web programmer for decades. I just completed a virtual 3D site using babylon.js with a lot of my own code thrown in. I have sat at help desks at IT departments. Normally i can help others with their issues, and normally i am able to get things to work myself. But, this issue has stumped me. My Gmail accounts all work perfectly using MS mail, just plug in the settings and go. Everything 'used' to work fine using TB, which i have used for many years, when i was able to use 'normal password' security, but, now Google is needing oauth, which i have programmed for custom calendar program using google maps and calendar API, and got web apps working fine with oauth2 as a web developer. I am not new to all this. But, like any other programmer, sometimes you miss one little thing and your whole program goes wacky. It is usually the tiny little mistakes that can take days to resolve ( like type if( x=1) which doesn't check if x is == to 1 rather it sets x = to 1. it should be if(x==1) I admit, i just made that dumb mistake last week and it took me nearly a week to find it) Here, something is obviously not set up right, but, i just can't figure it out on my own yet, Be nice if TB would report why it can get authorization, or what is not right, or Google would be more kind in explaining why it is refusing to authorize, but, i am not seeing any such helpful screens pop up to help me out. BTW, i did send the troubleshooting info,

account5: INCOMING: account5, , (imap) imap.gmail.com:993, 3, 10 OUTGOING: , smtp.gmail.com:465, 3, 10, true

Is account5 the troubled one? What's odd is that for all your accounts the settings for 'Connection security' and 'Authentication method' are coded. I'd expect something like 'SSL/TLS' and 'Oauth2' instead of '3, 10'.

Security Software Type: Name Antivirus: Microsoft Defender Antivirus

It is recommended to create an exception for the Thunderbird profile folder in your anti-virus software. To locate the profile folder see https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data#w_how-to-find-your-profile

I'd suggest the following: Create a full backup of your profile folder.

Delete any passwords and/or OAuth2 authentication tokens Thunderbird has remembered for the troubled account. Delete any Google related cookies in Thunderbird.

Delete the troubled account.

Restart Thunderbird.

Re-create the troubled account using automatic account setup. That should pick the correct server settings.

Enter your credentials when prompted, and give permission for Thunderbird to access your Gmail account.

Christ1 Again thanks for your reply. I get busy now and then and may not get back right away. But, I did what you suggested, backed up the profile, deleted gmail passwords, there were no google cookies, i deleted both my gmail accounts (neither are working) and tried to setup one, then the other, both failed. It automatically sets up the accounts, I get a green check on checking password, but, when i hit done and it tries to connect to google, it gives a yellow box with unable to log in at server the email address is correct, the password is correct, copy and pasted from my roboform account, and I logged out of both gmail account and logged back in with same password, so i know the password is correct. It really doesn't seem like a thunderbird problem, but, i don't see or know what to change in my gmail account(s). Right now I am just focusing on getting one account working. I'm wondering if i should just uninstall TB and start all over. But, if the problem is on google's side, that won't solve anything. Before I do that, I got a new (used, new to me) i7 Windows Tablet, so first I am going to install TB on that and see if the gmail accounts work, if they do, then i'll uninstall TB on this pc and try with new install. I'll let you know how the tablet works out.

I'm wondering if i should just uninstall TB and start all over.

I don't see how this would help. Profile files are stored separately from the Thunderbird program files. The program files are static and do not change (except when you upgrade the Thunderbird application version). Because we store profile and program files separately, you can uninstall Thunderbird without losing your messages and settings, and if something goes wrong with a Thunderbird update your information will still be available. It also means that you don't have to reinstall Thunderbird in order to delete your information or troubleshoot a problem.

I just installed TB and setup the gmail accounts on my (new to me) Windows 10 tablet, and they're working. There was one glitch - when i went to set up the first account and got to the authentication part, i used the same way i had been, which was to have Google send msg to my cell phone where i have to click on Yes to allow the new device/app google access. When i did that, this time Google (on the tablet) popped up a 400 error saying there was an error, and it didn't know why (can recall exact text, but, something like that). So, I then selected to verify by google sending a code to my phone's text msgs, and i entered that code in, and Wallah. Google and Thunderbird all worked fine (on my Tablet). I set up the second gmail account, no problem. So, i went back to my PC (laptop) and still no go. Even when i try to use the txt msg code to verify, TB still comes up with msg that it can't connect to server. This is really frustrating, i dont' have all the time in the world for this, for now, i either have to use MS mail, or TB on my tablet. I will keep trying, but something is sure not right. And, whatever it is, is on my Laptop. In Google it shows the devices google is associated with, so i deleted the laptop - then went through the process of adding it back, verified it, etc., and got google drive and the device working with google again, and still TB gives me the same error.

I send screen shot of the Yellow msg that TB shows after i try to verify account. The email and password are correct. I tried this N number of times, and for the password i use Roboform password manager - synced on all my devices, i pull the pswd from there, and it is same i use to log in to google, same as i used on my tablet to set up gmail in TB so i know the gmail address and pswd are correct. But, TB says in can't connect to server. What else can i try?

PC (laptop) check: The 'Firewall' must have 'Thunderbird' as an allowed program. You have probably already this, but worth checking.

re: there were no google cookies, if no google cookie then it will not work - gmail needs cookie. Do you have any program on computer that is cleaning up cookies or session files etc - if yes then Thunderbird needs to be an exception. Do not let program clean up files in Thunderbird. I have cookies:

• consent.google.com
• google.co.uk
• google.com

See image below

check: Thunderbird must have cookies enabled. Menu app icon > Preferences Select 'Privacy & Security' Under 'Web content' Select 'Accept cookies from sites'

Check: 2-step authentication method using app password. If this is switched on in gmail/google account then switch it off. I'm presuming you have now completely removed/switched off this method of authentication.

re: and for the password i use Roboform password manager synced on all my devices, i pull the pswd from there, and it is same i use to log in to google, same as i used on my tablet to set up gmail in TB so i know the gmail address and pswd are correct.

If setting cookies does not get the problem sorted then: Suggest you do not use Roboform - allow Thunderbird to remember the passwords so password manager will store the Oauth password. Once verified, Thunderbird would be using the Oauth2 password to access server not the ordinary password which you use to access gmail webmail account.

I'm also wondering is it possible Roboform is the cause of the weird data display in Thunderbird. Whatever you have set up to get messages on phone - please switch it off - is that something you have set up in Roboform ?

re : info you displayed as copied from More Troubleshooting Information account5:

    INCOMING: account5, , (imap) imap.gmail.com:993, 3, 10
    OUTGOING: , smtp.gmail.com:465, 3, 10, true

That is somehow very weird - that display should say this: account5: INCOMING: account5, ,(imap) imap.gmail.com:993 SSL/TLS OAuth2 OUTGOING: , smtp.gmail.com:465 SSL/TLS OAuth2 true

Account Settings: What do you see ? I've posted images which show settings. It is an earlier version of TB but the display of settings for gmail imap and smtp are the same.

Toad-Hall, Thanks for the lengthy reply. Unfortunately, things still are not working. Thunderbird is allowed in the Firewall, and besides, all my other emails work fine, and so DID gmail - its just stopped back in Oct or so for one account, and the other just stopped more recently (I think after i did something to get the other working). As far as cookies, they are enabled, and they are on my Windows Tablet as well, and yet, it also shows no google cookies, yet the 2 gmails are working fine on the tablet. And, I don't have any program that cleans up passwords, I do use Ccleaner to clean up my registry now and then, but, disable all the cookies, and temp file, those i clean up manually very seldom.

I 'had' the "use app password" enabled in gmail, only because that is what i saw online as a solution when TB doesn't work with gmail anymore (not this forum, don't know where i saw that), but, i have disabled it in google. Roboform is only a password manager, and the password is needed to set up the account. Its just that TB says it cannot connect to serve and says that the email or password is likely wrong. I was just pointing out that they are not wrong, and i used the same gmail passwords to set up the accounts on the Tablet. Roboform doesn't override thunderbird - it doesn't interject the password, you have to tell it to enter it into a form. Roboform doesn't work with email or interject on it's own, it will when you use it inside the broswer to go to a page and login, but, there is no way to enable it to overside on an email program. Anyway, I also entered the passwords n manually many times trying to get this to work.

I don't know why my info shows code numbers rather then the words for SSL/TLS  Oauth2   But, it does show them properly, like yours, in the account settings for both the imap and smtp.

I mentioned before that I will probably uninstall TB and start all over from scratch. Christ1 told me that would not probably work, but, if it is supposed to be showing labels for authorization and security in the troubleshooting info data, maybe the program is corrupt somewhere - so first I will try a fresh install, of just the program, if that doesn't work, then i will delete the AppData/ for Thunderbird, the profiles, etc, and reinstall from scratch, I mean, used to work and it is working fine on my Tablet,

Toad-Hall, Christ1, Matt thank all of you, I FINALLY solved the mystery. After uninstalling reinstalling TB, and deleting all the profile, (which i had backed up) it still failed. I deleted TB from the firewall, and put back in, nothing was working. When i finally found the problem, i gave myself a swift hard kick in A__ for not figuring it sooner. I have been developing a website that included php, so i have XAMPP but only have Apache running (not mercury or tomcat which run mail servers). It was Apache - the localhost server.... And, it only gives problem when setting up the Gmail account, no problem AFTER the gmail account is verified. But, to verify the account, the localhost server must interfere with TB trying to connect to Google's servers for the purpose of account authentication. Since I am developing the site, i automatically start XAMPP and Apache on bootup, and like it said once the google account is set up, no problem reading or sending email. So, I stopped Apache (Xampp window still open) and Wallah, TB authenticated the gmail accounts Turned Apache back on, and no problem reading/sending emails. I never thought about it, because I've had it on and running for months and it gives no problem to read or send emails, and i am not running a local email server. Plus i have it come up and run Apache automatically, so i just never even thought about it. But, after literally trying EVERYTHING else, i kept wondering what is on my laptop that TB can't connect to google...? Anyway, you should add this to your list of things to check for when someone can't authenticate a new gmail account. XAMPP with Apache running - has to be stopped while authenticating. Again, thanks to all of you

The flow ends with the connection being passed to localhost with the necessary token for oauth. if something else is monitoring and consuming on that port then Thunderbird does not get the token. I do not know what happens when the tokens are renewed, I do not understand the oauth flow at all really.

Toad-Hall, Christ1, Matt thank all of you, I FINALLY solved the mystery. After uninstalling reinstalling TB, and deleting all the profile, (which i had backed up) it still failed. I deleted TB from the firewall, and put back in, nothing was working. When i finally found the problem, i gave myself a swift hard kick in A__ for not figuring it sooner. I have been developing a website that included php, so i have XAMPP but only have Apache running (not mercury or tomcat which run mail servers). It was Apache - the localhost server.... And, it only gives problem when setting up the Gmail account, no problem AFTER the gmail account is verified. But, to verify the account, the localhost server must interfere with TB trying to connect to Google's servers for the purpose of account authentication. Since I am developing the site, i automatically start XAMPP and Apache on bootup, and like it said once the google account is set up, no problem reading or sending email. So, I stopped Apache (Xampp window still open) and Wallah, TB authenticated the gmail accounts Turned Apache back on, and no problem reading/sending emails. I never thought about it, because I've had it on and running for months and it gives no problem to read or send emails, and i am not running a local email server. Plus i have it come up and run Apache automatically, so i just never even thought about it. But, after literally trying EVERYTHING else, i kept wondering what is on my laptop that TB can't connect to google...? Anyway, you should add this to your list of things to check for when someone can't authenticate a new gmail account. XAMPP with Apache running - has to be stopped while authenticating. Again, thanks to all of you

I've stopped IIS on Windows and, after two months, I got TB running again. I don't think I would ever have thought of that possibility. Thank you very much!

just wanted to post my experience trying to get gmail oauth2 to work ...

i've been running TB 45 forever and gmail oauth2 definitely didn't work for me with that version on W7 x64 ... i updated to 91.9 and still no dice ... i ultimately discovered that NO passwords would save, which of course includes the oauth token ... deleting multiple suggested TB config files didn't solve the problem either ... it was also NOT practical to recreate accounts from scratch since i had to fix this problem for many clients and myself, and many of us had multiple accounts configured in TB, with many of the accounts containing 30 GB or more emails ...

so here's what i finally came up with to get this upgrade to work reliably:

1. backup copy local/thunderbird and roaming/thunderbird folders

2. run TB 45, remove all addons, and exit

3. uninstall TB 45

4. empty local/thunderbird

45 delete everything in roaming/thunderbird except: prefs.js, Mail, ImapMail, virtualFolders.dat, folderTree.json, directoryTree.json, *.mab files

6. install TB 91.9 x64

7. run TB 91 and when the profile section box pops up,. select the default profile, checking the box to remember it permanently

8. TB 91 will convert all gmail accounts to oauth, so popups for the oauth login procedure will occur for all gmail accounts, so go through the oauth process for each of those, providing the required password and any subsequently requested secondary security verification information via smartphone SMS or secondary security email security code, and also indicate to all other security verification emails that you are the one who initiated these activities ... enter and save conventional passwords as well for non-gmail accounts ...

9. you can verify that all conventional passwords and oauth tokens got saved via TB preferences/privacy & security/saved passwords

10. import contacts in all .mab files (which are otherwise obsolete and unrecognized by newer TBs ...

10. nice addons are Phoenity Buttons, Phoenity Icons, riseofthetools, search button, lookout (fix version)

11. some old x86 TBs leave behind broken user registry keys regarding TB mailto protocols, so these can be deleted for each logged in Windows user with:

[-HKEY_CURRENT_USER\Software\Classes\Thunderbird.Url.mailto]

&

[-HKEY_CURRENT_USER\Software\Classes\ThunderbirdEML]

12. TB font sizes can be changed by changing the value of font.size.systemFontScale from 100 to something larger (or smaller) in general/config editor

Recently, it has been discovered that deleting a few files from the profile name folder gets it up and running. But that is not always the fix especially when the question is related to running eg: Apache as is this particular case.

For anyone with OAuth2 issue who reads this question. If you do not have identical problem eg: running localhost servers See this question:

• https://support.mozilla.org/en-US/questions/1376290

I really would like to understand why running a web server on localhost gets in the way. Google can certainly not directly send requests to it, so TB may be using some kind of reverse proxying. If that is the case, then there *should* be a way to configure the port TB uses for this purpose.