User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20100101 Firefox/10.0.2 Build ID: 20120215223356 Steps to reproduce: Hello, we are migrating Mailboxes from cyrus based imap4 to Exchange 2010. We have 2 backend Servers and a frontend Server. Mails with Attachments wont be downloaded fully, resulting in corrupt pdf's for example. Actual results: incomplete mail download. Other testet imap Clients like k-9 mail or claws-mail or outlook can do it error free. Expected results: complete mail download ! i saved a mail-sourcecode of an email from myself with 4 pictures attached. thunderbird shows 3 attachments, the 3rd is only halfe there. Filesize of that windows-saved .txt is 514.248 Bytes

i deleted my inbox file several times, so TB should reload contents. 3 times mail was incomplete, 2 times it was complete. like i said, other users (3 and counting up) have the issue too.

maybe some nic mtu issue or whatever ?

likely some duplicate: https://bugzilla.mozilla.org/show_bug.cgi?id=512693 https://bugzilla.mozilla.org/show_bug.cgi?id=560346 http://kb.wisc.edu/helpdesk/page.php?id=12472 however, if this helps users i would recommend Thunderbird to detect Exchange imap Serviers: * OK The Microsoft Exchange IMAP4 Service is ready and set those values for themselves ?!?

Bug 92111 Comment #45 has a workaround which may resolve the problem. On Windows, go into Tools > Options > Advanced > General and click on Config Editor. There, enter fetch_by_chunks into the search bar of the preferences dialog and set all mail.server.<whatever>.fetch_by_chunks to "false" by double-clicking on them. Usually you may only see mail.server.default.fetch_by_chunks unless a setting specific for a server was established (<whatever> = server#).

Uli does that help ?

Hello, thanks for the hint, we appllied the setting to 4 Clients, and are watching. Are there by any chance ways to set this for all users ? Like send them an email to >click here< and whoops its changed ? greetings

No :(