A heads-up not directly related to the October SUs for Exchange, but important to be aware of if you are running Exchange on-premises: There are reports that last Tuesday’s patches for WIndows Server could break Exchange functionality.
The patches which might cause issues are:
Reported issues include Outlook Web Access (OWA) failures, with the following being logged in the Application event log:
Source: MSExchange Replication Service
Event ID: 1006
Description: The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.
Database: <Mailbox DB>
Error: MapiExceptionMdbOffline: Unable to make connection to the server. (hr=0x80004005, ec=1142).
- Mail flow disruptions and growth of mail queues.
Microsoft is investigating the issue.
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