This might be one of those "if you need to ask you won't understand the answer" situations.

LDAP is used for many things; in particular it is used by Thunderbird to allow a communal address book to be seen and used in Thunderbird's Address Book. You'll need an LDAP server set up to do this, and this is the point at which it stops being relevant to most home users. At my workplace, it allows the company-wide address book to appear in Thunderbird.

The phrasing of your question has me thinking that you're expecting to have an address book for each email account. It doesn't normally work this way; your Address Book and its subdivisions (e.g. Personal Address Book, Collected Addresses etc) are common to all your accounts.

This add-on allows you to nominate which address books will be used by each email account, but this only applies to autocomplete; if you prefer to select Contacts by hand from a list then this feature is irrelevant to you.

Everything you say is true. Your perception is amazing. I did want to assign specific address books to specific accounts. I would be happy to do that with Autocomplete, but the link for the add-on you sent does not work. ("This add-on") Is there an add-on that I could load directly from "Add-ons" in the drop-down menu of Thunderbird which would serve the purpose? I was not able to find one by reading the descriptions of the various add-ons.

I am attaching an image which shows the message on my browser when I click on the link.

Thank you for your help

Mike Nyland

Sigh. Unfortunately what you have encountered is a common issue with this particular author's site. He has written many useful add-ons, several of which I use on a daily basis. Some comments about this on another useful forum: http://forums.mozillazine.org/viewtopic.php?f=28&t=1938089

I would urge you to work past the warnings and go to his site. He has placed some of his addons on mozilla's site, such as: https://addons.mozilla.org/en-US/thunderbird/addon/importexporttools/

I offer this one as evidence of the quality, value and trustworthiness of Kaosmos's offerings.

I have some notes on my own site about how to install addons when found outside the built-in search system. http://xenos-email-notes.simplesite.com/416814616

And this link below might avoid the warning you saw before:https://freeshell.de/~kaosmos/morecols-en.html

Or you could go directly to the addon: https://freeshell.de/~kaosmos/morefunctionsforAB-TB3-0.7.3.xpi

Thank you very much for all your help. I was able to download and attach the add-on to Thunderbird as you suggested on your site. The add-on works as I was hoping it would.

Thanks again,

Mike Nyland