Today we are announcing the latest set of Cumulative Updates for Exchange Server 2016 and Exchange Server 2013. These releases include fixes to customer reported issues and updated functionality. Exc...
Updated Jul 01, 2019
Version 2.0
Blog Post
Good morning!
After installing CU4 we’ve got the following problems.
POP3 (verified for Outlook 2013, Thunderbird and Apple Mail): When POP3 is configured to leave the downloaded messages on the server, it will re-download all messages at least once a week. We have noticed, that the X-UIDL is different in each copy.
IMAP: IMAP resyncs every week. It looks like every single E-Mail is downloaded once every week.
MAPI: Users with big (or many) mailboxes noticed, that the synchronization times have grown. It seems that Outlook resyncs everything completely.
We are currently running Exchange 2016 CU4 on Windows Server 2012R2 (3 Servers, DAG) with Sophos Pure Message.
We have (of cause) done some testing in our lab before the productive rollout but since the problem occurs once a week it hasn’t been noticed.
Any hints?