Today the Exchange Team released Rollup 6 for Exchange Server 2010 Service Pack 2 (KB2746164). This update raises Exchange 2010 version number to 14.2.342.3.

Here’s the list of changes included in this Rollup:

• 2489941 The “legacyExchangeDN” value is shown in the “From” field instead of the “Simple Display Name” in an email message in an Exchange Server 2010 environment
• 2717453 You cannot move or delete a folder by using Outlook in online mode in an Exchange Server 2010 environment
• 2733608 Corrupted Japanese DBCS characters when you send a meeting request or post a reply to a posted item in a public folder in an Exchange Server 2010 environment
• 2734635 Folder-associated information (FAI) items are deleted when you run the New-InboxRule cmdlet or change Inbox rules in an Exchange Server 2010 environment
• 2737046 AutoPreview feature does not work when you use Outlook in online mode in an Exchange Server 2010 environment
• 2741117 High CPU utilization by Microsoft Exchange Replication service on Client Access servers in an Exchange Server 2010 environment
• 2746030 Incorrect ExternalURL value for EWS is returned by an Exchange Server 2010 Client Access server
• 2750188 Exchange Service Host service crashes when you start the service on an Exchange 2010 server
• 2751417 Synchronization fails if you sync an external device to a mailbox through EAS in an Exchange Server 2010 environment
• 2751581 OAB generation fails with event IDs 9126, 9330, and either 9338 or 9339 in an Exchange Server 2010 environment
• 2760999 “The signup domain ‘org’ derived from ‘<TenantDomainName>.org’ is not a valid domain” error message when you use the Hybrid Configuration wizard in an Exchange Server
• 2776259 Msftefd.exe process crashes if an email attachment has an unexpected file name extension or no file name extension in an Exchange Server 2010 environment
• 2779387 Duplicated email messages are displayed in the Sent Items folder in a EWS-based application that accesses an Exchange Server 2010 Mailbox server
• 2783586 Name order of a contact is displayed incorrectly after you edit the contact in an Exchange Server 2010 environment
• 2783631 User-Agent field is empty when you run the Get-ActiveSyncDeviceStatistics cmdlet in an Exchange Server 2010 SP2 environment
• 2783633 You cannot move or delete an email message that is larger than the maximum receive or send size in an Exchange Server 2010 environment
• 2783649 Private appointment is visible to a delegate in an Exchange Server 2010 environment
• 2783771 Mailbox on a mobile device is not updated when EAS is configured in an Exchange Server 2010 environment
• 2783772 Edgetransport.exe process crashes after a journal recipient receives an NDR message in an Exchange Server 2010 environment
• 2783776 You cannot perform a cross-premises search in a mailbox in an Exchange Server 2010 hybrid environment
• 2783782 Error message when you use Scanpst.exe on a .pst file in an Exchange Server 2010 environment
• 2784081 Store.exe process crashes if you add certain registry keys to an Exchange Server 2010 Mailbox server
• 2784083 Week numbers in the Outlook Web App and Outlook calendars are mismatched in an Exchange Server 2010 environment
• 2784093 SCOM alerts and event ID 4 in an Exchange Server 2010 SP2 organization that has Update Rollup 1 or later
• 2784566 Exchange RPC Client Access service crashes on an Exchange Server 2010 Mailbox server
• 2787023 Exchange Mailbox Assistants service crashes when you try to change a recurring calendar item or publish free/busy data in an Exchange Server 2010 environment
• 2793274 A new option is available that disables the PermanentlyDelete retention action in an Exchange Server 2010 organization
• 2793278 You cannot use the search function to search for mailbox items in an Exchange Server 2010 environment
• 2793279 Exchange Server 2010 does not restart when the Microsoft Exchange Replication service freezes
• 2793488 Internet Explorer freezes when you connect to the OWA several times in an Exchange Server 2010 environment
• 2810616 Email message delivery is delayed on a Blackberry mobile device after you install Update Rollup 4 for Exchange Server 2010 SP2

In addition to these fixes, this Rollup also includes a fix for the security issue described in Microsoft Security Bulletin MS13-012.

As of Rollup 4, its no longer required to disable/re-enable ForeFront Protection for Exchange using the fscutility to be able to install the Rollup properly. However, if you want to remain in control, you can disable ForeFront before installing the Rollup using fscutility /disable and re-enable it afterwards using fscutility /enable.

If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking.

If you got a DAG and want to properly update the DAG members, check the instructions here.

Note that Rollups are cumulative, i.e. they contain fixes released in earlier Rollups for the same product level (RTM, SPx). This means you don’t need to install previous Rollups during a fresh installation but can start with the latest Rollup.

As with any Hotfix, Rollup or Service Pack, I’d recommend to thoroughly test this rollup in a test and acceptance environment first, prior to implementing it in production.

You can download Exchange 2010 SP2 Rollup 6 here.