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Why am I unable to add attachments to my outgoing mails?

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Both the 'Attach' button and the 'Attach' menu in the Compose Message window are greyed out by default. Thanks.

Both the 'Attach' button and the 'Attach' menu in the Compose Message window are greyed out by default. Thanks.

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hold shift while clicking to start Thunderbird.

In safe mode does it occur the same way?

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Thanks Matt, Followed your instruction and opened Thunderbird in Safe mode. Can attach files to a new message in safe mode. Have now closed Thunderbird again and re-opened, and it appears that I can now add attachments when composing messages. Many thanks.