Software Update: Microsoft Exchange Server 2013 CU 18

Microsoft has already released the eighteenth Cumulative Update for Exchange Server 2013. Exchange Server 2013 was released in January 2013. Mainstream support from Microsoft will run until April 2018 and extended support will run until April 2023. Only security and time zone updates will be implemented during this extended period. For a general discussion about Exchange Server 2013, you can visit the General Exchange 2013 topic on our forum. The KB article with number 4022631 mentions the following changes:

Cumulative Update 18 for Exchange Server 2013

Cumulative Update 18 for Microsoft Exchange Server 2013 was released on September 19, 2017. Several nonsecurity issues are fixed in this cumulative update or a later cumulative update for Exchange Server 2013. This release includes support for Windows time zone updates released through September 19, 2017 .

Issues that this cumulative update fixes

This cumulative update fixes the issue that is described in the following Microsoft Knowledge Base articles:

• KB4040755 New health monitoring mailbox for databases is created when Health Manager Service is restarted in Exchange Server 2013
• KB4040121 You receive a corrupted attachment if email is sent from Outlook that connects to Exchange Server in cache mode
• KB4040120 Synchronization may fail when you use the OAuth protocol for authorization through EAS in Exchange Server 2013
• KB4036108 Security update for Microsoft Exchange: September 12, 2017

This update also includes new daylight saving time (DST) updates for Exchange Server 2013. For more information about DST, see Daylight Saving Time Help and Support Center.