On Thursday Dec 11, 2014 Microsoft released new updates for Exchange 2007, 2010, and 2013. Read more here.
However, an issue has been identified in the Exchange Server 2010 SP3 Update Rollup 8. The update has been recalled and is no longer available on the download center pending a new RU8 release. Customers should not proceed with deployments of this update until the new RU8 version is made available. Customers who have already started deployment of RU8 should rollback this update.
The issue impacts the ability of Outlook to connect to Exchange.
Please note: this issue only impacts the Exchange Server 2010 SP3 RU8 update, the other updates remain valid and customers can continue with deployment of these packages.