<p>Microsoft recently released Cumulative Update 3 (CU3) for Exchange Server 2013, as well as Update Rollup 3 (RU3) for Exchange Server 2010 Service Pack 3.</p><p>Exchange Server 2010 SP3 RU3 can be downloaded at this page. Exchange Server 2013 CU3 is available at the Microsoft Download Center here, along with unified messaging language packs.</p><p>The CU3 release reflects Microsoft's new quarterly release cycle for cumulative updates announced back in April. Update rollups, on the other hand, are still released on a monthly basis. Unlike cumulative updates, update rollups don't include previous releases, and so update rollups have to be installed sequentially.</p><p>Microsoft recommends testing and applying the cumulative updates particularly for organizations that run "hybrid" Exchange configurations -- that is, organizations with computing environments that combine Exchange Online with premises-based Exchange Server installations. The idea is to better assure that the hosted and server versions of Exchange are running the same code, but it's actually more than just a recommendation, per Microsoft.</p><p><a href="http://rcpmag.com/articles/2013/12/06/exchange-2013-exchange-2010-sp3-updated.aspx">Keep reading...</a></p>