The Exchange team is announcing today the availability of Cumulative Update 8 for Exchange Server 2013. The Cumulative Update Package and UM Language Packs are now available on the Microsoft Download Center. Cumulative Update 8 represents the continuation of our Exchange Server 2013 servicing and builds upon Exchange Server 2013 Cumulative Update 7. The release includes fixes for customer reported issues, minor product enhancements and previously released security bulletins. A complete list of customer reported issues resolved can be found in Knowledge Base Article KB3030080. Customers running any previous release of Exchange Server 2013 can move directly to Cumulative Update 8 today. Customers deploying Exchange Server 2013 for the first time may skip previous releases and start their deployment with Cumulative Update 8 directly.

We would like to call your attention to a few items in particular about the Cumulative Update 8 release:

  • Calendar and Contact Modern Public Folders favorites added in Outlook are now accessible in OWA
  • Batch Migration of Public Folders to 2013 improves migration throughput and PF migration experience
  • The number of supported Public Folders has increased once again for on-premises deployments (O365 limits remain the same)
  • Smoother migration for EAS clients to O365 with automatic profile redirect upon successful Hybrid migration to O365 (EAS client must support HTTP 451 redirect)

For the latest information and product announcements please read What’s New in Exchange Server 2013, Release Notesand product documentation available on TechNet.

Cumulative Update 8 may include Exchange related updates to the Active Directory schema and Exchange configuration when compared with the version of Exchange 2013 you have currently deployed. Microsoft recommends all customers test the deployment of a cumulative update in their lab environment to determine the proper installation process for your production environment. For information on extending the schema and configuring Active Directory, please review the appropriate TechNetdocumentation.

Also, 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. If the policies are NOT set to Unrestricted you should use the resolution steps in KB981474to adjust the settings.

In Exchange 2013 CU8 we are also delivering another milestone of public folder scalability improvements for our on-premises customers. When you are migrating from legacy versions of Exchange 2007/2010 to Exchange 2013 CU8 we now support migrating up to 500,000 public folders, a 200% increase from CU7. After your migration to Exchange 2013 CU8 has completed, or you are starting in a greenfield deployment of Exchange 2013 CU8, we now support up to 1,000,000 public folders, a 400% increase from CU7. The number of supported public folder mailboxes remains at 100 for the time being. In addition no single public folder mailbox in the organization may contain more than 100,000 public folders. The 100,000 value includes both active and deleted public folders stored within the public folder mailbox that have not yet aged out of the system due to your configured deleted public folder retention settings. Please remember that on-premises public folder scale limits are not the same as those used in Exchange Online. Exchange Online limits can be found at this article, and this documentationwill be updated in the near future to reflect Exchange 2013 CU8 on-premises’ new limits.

Reminder:Customers in hybrid deployments where Exchange is deployed on-premises and in the cloud, or who are using Exchange Online Archiving (EOA) with their on-premises Exchange deployment are required to deploy the most current (e.g., CU8) or the prior (e.g., CU7) Cumulative Update release

Source : http://blogs.technet.com/b/exchange/archive/2015/03/17/announcing-cumulative-update-8-for-exchange-server-2013.aspx

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