Today, Cumulative Update 5 for Exchange Server 2013 was released by the Exchange Team (KB2936880). This update raises Exchange 2013 version number to 15.0.913.22.
This Cumulative Update contains the following fixes compared to SP1 (CU4):
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2963590 Message routing latency if IPv6 is enabled in Exchange Server 2013
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2963566 Outlook Web App accessibility improvement for UI appearance in Exchange Server 2013
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2962439 You cannot sync contacts or tasks in Microsoft CRM client for Outlook in an Exchange Server 2013 environment
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2962435 CRM synchronization fails if the time zone name of a meeting is not set in an Exchange Server 2013 environment
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2962434 Slow performance in Outlook Web App when Lync is integrated with Exchange Server 2013
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2958430 “Some or all Identity references could not be translated” error when you manage DAG in Exchange Server 2013 SP1 in a disjoint namespace domain
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2957592 IME is disabled in Outlook Web App when you press Tab to move the focus in an email message in Exchange Server 2013
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2942609 Exchange ActiveSync proxy does not work from Exchange Server 2013 to Exchange Server 2007
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2941221 EWS integration for Lync works incorrectly in an Exchange Server 2013 and 2007 coexistence environment
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2926742 Plain-text message body is cleared when writing in Outlook Web App by using Internet Explorer 8 in Exchange Server 2013
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2926308 Sender’s email address is broken after importing a PST file into an Exchange Server 2013 mailbox
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2925559 Users always get the FBA page when they access OWA or ECP in Exchange Server 2013
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2924519 “SyncHealth\Hub” folder is created unexpectedly after installing Cumulative Update 2 for Exchange Server 2013
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2916113 Cannot open .tif files from email messages by using Windows-based applications in an Exchange Server 2013 environment
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2592398 Email messages in the Sent Items folder have the same PR_INTERNET_MESSAGE_ID property in an Exchange Server 2010 environment
Notes:
- Be advised that this CU includes a Managed Availability probe configuration that may result in the frequently restarting of the Microsoft Exchange Shared Cache Service in some environments. More information, see KB2971467.
- Be advised of OAB architectural changes documented here. If you are affected, it is recommended to update CAS servers prior to Mailbox servers.
This Cumulative Update includes schema and AD changes, so make sure you run PrepareSchema / PrepareAD. After updating, the schema version will be 15300.
Note that Cumulative Updates can be installed directly, i.e. no need to install RTM or Service Packs prior to installing Cumulative Updates. Note that once installed, you can’t uninstall a Cumulative Update nor any of the installed Exchange server roles. The order of upgrading servers is irrelevant, unlike with previous generations of Exchange.
Finally, and I can’t emphasize this enough: For any Hotfix, Rollup, Service Pack or Cumulative Update, I’d recommend to thoroughly test this in a test and acceptance environment first, prior to implementing it in production. When you lack such facilities, hold out a week or two and monitor the comments on the release article or TechNet forum for any issues.
You can download Exchange 2013 Cumulative Update 5 here; UM Language Packs can be found here. More details about these changes, preparing Active Directory or installing this Cumulative Update can be found in the original announcement.
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