Exchange Server 2013 Cumulative Update 3

With the Exchange Team announcement last week that Exchange 2013 Service Pack 1 will be coming in early 2014, this is essentially CU4, you knew CU3 announcement was due at any point.
That point was Monday, this cumulative update brings a number of fixes found KB2892464.

This CU can be applied directly to RTM version of 2013, however the Cumulative Update 3 includes Exchange related updates to Active Directory schema and configuration changes.

It is also recommended to prevent installation issues you should ensure that the Windows PowerShell Script Execution Policy is set to “Unrestricted” on the server being upgraded or installed.

To verify the policy settings, run the Get-ExecutionPolicy cmdlet from PowerShell on the machine being upgraded, remember to reset once the update has been applied.

The Exchange Team Blog – Source
Description of Cumulative Update 3 for Exchange Server 2013 – KB2892464
Cumulative Update 3 for Exchange Server 2013 (KB2892464) – Download

Exchange Server 2013 Service Pack 1 Coming in Early 2014

The Microsoft Exchange Server team has announced the upcoming availability of Service Pack 1 for Exchange Server 2013, scheduled for release in “early 2014″.
Service Pack 1 will include:

• Windows 2012 R2 Support
• S/MIME support for OWA
• Edge Transport Role

More details to be released once the Service Pack release date is confirmed.
The Exchange team also said that Service Pack 1 is essentially CU4. Considering we are at CU2 right now that leaves open the question of when CU3 will be released. The Exchange Team Blog – Source