Mailboxes are migrated from Exchange 2010 - 2013. About 1 out of 10 mailboxes exhibit a condition with Thunderbird (version 31.1.2) will not display new messages in the inbox. We are running Exchange 2010 SP3 rollup 6 and Exchange 2013 CU5. One version out on both systems but there is a schedule to update to latest versions in next 2 weeks. Thunderbird is set up for default settings except that junk filtering is turned off. When starting Thunderbird all new messages appear but anything received after this point will not be displayed in Inbox. When a ‘rule’ is applied to a message to move to a different folder; then it will be displayed in the appropriate folder as a new message. No amount of checking or resynchronizing will get the message to appear in the Inbox. If I close the application and go back in then the new messages delivered already will appear with the correct time of delivery, If I use another computer the issue persists on this different computer OS doesn’t matter; Windows Mac Linux. If I configure Thunderbird for a different user then this new user works fine on a previously installation where it didn’t work before! (i.e. it is not the installation of Thunderbird alone nor is it an issue with a specific OS) If I configure Outlook 2013 using IMAP then new messages are displayed in the Inbox without any issues. The issues seems constant with a specific mailbox migrated from 2010 to 2013. New mailboxes created on 2013 do not seem to have this issue. So far we have migrated a couple of dozen mailboxes and 2 have the issue. We have stopped migrations until we can resolved this issue. I opened a case with MS support and they have confirmed what we already know; the message is being delivered to the mailbox. Since it doesn’t occur using Outlook it has been concluded that this is an issue with some mailboxes using Thunderbird. There are no errors reported on either local computer or our Exchange servers. Thunderbird doesn’t report any errors either even when a messages is sent from to the same mailbox using Thunderbird; it will not appear in the inbox until the application is closed and opened again.
Has anyone else even heard about this condition, if so please tell me as I don’t wish to be the only person with this issue. And please don’t offer suggestions about not using Thunderbird as we have some Linux users who don’t like using OWA and really don’t wish to change their preferred email client.