On March 17 Microsoft released the 8^th Cumulative Update for Exchange Server 2013, 98 days after the release of CU7 which is nicely in line with the quarterly release cadence of Cumulative Updates. This Cumulative Update is called CU8, not a word about Service Pack 2, so SP1 still continues to be the officially supported Service Pack.

There are some new features in CU8 that are worth noticing.

• With CU8 there are improvements for mobile clients in a Hybrid Configuration. When a Mailbox is moved the Outlook client will automatically detect and reconfigure accordingly. This was not the case with Mobile clients. This behavior has changed in CU8. When a mobile client connects the local Exchange server and the Mailbox is moved to Exchange Online an additional check for the TargetOWAUrl on the Organization Relationship object is performed. This will return an HTTP/451 redirect to the mobile client which in turn will be redirected to this new URL. This feature will be available to all EAS compatible devices that can handle the HTTP/451 redirect option. Unfortunately this feature is only available for onboarding customers (i.e. to Office 365) and not for offboarding (from Office 365) customers.
• There an improved migration for Public Folders migration, now supporting batch migrations. This is faster (supports multiple jobs), more reliable and provides an easier migration management.
• CU8 supports viewing calendar and contact types of modern Public Folders in OWA

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