Notice
This update is no longer available. To fix the issues that are described in this article, install the latest Microsoft Exchange Server update from the following Microsoft Learn article:
Exchange Server build numbers and release dates
Microsoft provides download files only for N-2 versions for an Exchange Server cumulative update (CU), where "N" is the latest CU. The latest CU can be used to recover servers that are running Exchange Server. This includes servers that have a previous CU installed.
Summary
Update Rollup 12 for Microsoft Exchange Server 2010 Service Pack 3 (SP3) was released on December 15, 2015. This update rollup fixes various issues. Before you install this update, you must remove all interim updates for Exchange Server 2010 SP3. Also, see this important information about how to install this update.
Issues that the update rollup fixes
This update fixes the issues that are described in the following Microsoft Knowledge Base article:
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KB 3048372 Exchange Calendar items are shifted incorrectly when some Windows DST updates are applied
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KB 3106421 Very long URLs in an email message don't open in OWA in Internet Explorer
This update also includes new daylight saving time (DST) updates for Exchange Server 2010 SP3. For more information about DST, go to Daylight Saving Time Help and Support Center.
More Information
Installing this update on a DBCS version of Windows Server 2012
You can't install or uninstall Update Rollup 12 for Exchange Server 2010 SP3 on a double-byte character set (DBCS) version of Windows Server 2012 if the language preference for non-Unicode programs is set to the default language. To work around this issue, you must first change this setting. To do this, follow these steps:
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In Control Panel, click Clock, Region and Language, click Region, and then click Administrative.
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In the Language for non-Unicode programs area, click Change system locale.
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On the Current system locale list, select English (United States), and then click OK.
After you successfully install or uninstall Update Rollup 12, revert this language setting as appropriate.
References
Learn about the terminology that Microsoft uses to describe software updates.
