Exchange Team has released update rollup 1 for Exchange 2010 SP3 deployments.
Download 2010 SP3 UR1
A known issue with Exchange 2010 SP3 RU1 Setup:
You cannot install or uninstall Update Rollup 1 for Exchange Server 2010 SP3 on the 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:
- In Control Panel, open the Clock, Region and Language item, and then click Region.
- Click the Administrative tab.
- In the Language for non-Unicode programs area, click Change system locale.
- On the Current system locale list, click English (United States), and then click OK.
After you successfully install or uninstall Update Rollup 1, revert this language setting, as appropriate.