This article describes Cumulative Update 1 (CU1) for Microsoft Exchange Server 2013 that provides the latest fixes for Exchange Server 2013 and contains stability and performance improvements. This update enables you to install Exchange Server 2013 in your existing Exchange Server 2010 or 2007 organization.
Note The CU1 package can be used to perform a new installation, or to update an existing Exchange Server 2013 installation to CU1.
For more information about coexistence of Exchange 2013 and earlier versions of Exchange Server, go to the following Microsoft Website:
Exchange 2013 setup will identify any missing prerequisites.
You have to restart the computer after you apply this cumulative update package.
You do not have to make any changes to the registry after you apply this cumulative update package.
After you install this cumulative update package, you cannot uninstall the cumulative update package to revert to an earlier version of Exchange 2013. If you uninstall this cumulative update package, Exchange 2013 is removed from the server.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates