What happened to Cumulative Update 4 for Exchange Server 2013?
Microsoft has announced the release of Exchange Server 2013 Service Pack 1, containing several new features, improvements, and bug fixes.
Microsoft has announced that they plan to release Service Pack 1 for Exchange Server 2013 in early 2014.
The step by step guide for installing Cumulative Updates and Service Packs in an Exchange Server 2013 environment.
How to install Exchange Server 2010 Service Pack 3 to an existing Exchange Server environment.