Notice

This update is no longer available. To fix the issues that are described in this article, install the latest Microsoft Exchange Server update from the following Microsoft Docs article:

Exchange Server build numbers and release dates

Microsoft provides download files only for N-2 versions for an Exchange Server cumulative update (CU), where "N" is the latest CU. The latest CU can be used to recover servers that are running Exchange Server. This includes servers that have a previous CU installed.

Summary

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 System Requirements

References

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

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