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.

Download Exchange Server 2013 RTM CU1 here.

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

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About Paul Cunningham

Paul is a Microsoft Exchange Server MVP and publisher of Exchange Server Pro. He also holds several Microsoft certifications including for Exchange Server 2007, 2010 and 2013. Connect with Paul on Twitter and Google+.

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