Exchange Server 2013 RTM Cumulative Update 1 (CU1) Released

Microsoft has released Cumulative Update 1 (CU1) for Exchange Server 2013 RTM.

This is a significant update for two reasons. It is the first release of a CU under Microsoft’s new servicing model for Exchange Server 2013. And it is the minimum version of Exchange 2013 required for on-premises co-existence with Exchange 2007 (SP3 UR10) and Exchange 2010 (SP3).

Some important points to note:

• Cumulative updates are a full server upgrade, similar to service packs for previous versions of Exchange, not a minor update like an Update Rollup.
• Exchange 2013 RTM CU1 includes an AD schema update and some AD permissions changes. Read the release notes for full details.
• There is some preparation required for your existing OAB configuration to ensure the new Exchange 2013 OAB that is created does not cause unwanted network traffic.

Aside from the co-existence support and considerations there are also some improvements for existing Exchange 2013 RTM environments.

• Address Book Policy Routing Agent has been included.
• Groups can now be owners/managers of other groups (in a fully supported and easier to manage way)
• Exchange 2013 OWA can now access Exchange 2013-hosted public folders
• A bunch of improvements to the Exchange Admin Center
• Several high availability and manageability enhancements

Download Exchange Server 2013 RTM CU1 here.

Deployment Steps: refer to Installing Cumulative Updates for Exchange Server 2013.

More coverage:

• Exchange 2013 RTM CU1 Stops Transport During Prerequisite Check
  
• New Features in OWA 2013 RTM CU1
• Exchange 2013 CU1 – the software that RTM could have been