[Bug 220991] Re: Thunderbird corrupts attachments from IMAP exchange server

[Theodotos Andreou]

There is a workaround for this. It seems that there is some wrong
default configuration in Thunderbird:

In thunderbird go to Preferences > Advanced > Config Editor… and set
mail.server.default.fetch_by_chunks to FALSE. Old emails will need to be
redownloaded to fix the attachments.

http://allanmcrae.com/2010/05/thunderbird-vs-excange-imap/

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Thunderbird corrupts attachments from IMAP exchange server
https://bugs.launchpad.net/bugs/220991
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