From the description of this Update Rollup (http://support.microsoft.com/kb/2608646), there are quite a number of fixes that is relief to solve the serious crashes and bugs that reported since the released of update rollup 5 in August.
- 2431609 An update is available that updates the message of a retention policy in OWA for Exchange Server 2010
- 2449266 EWS drops the TCP connection to the EWS client application without any error message in a Microsoft Exchange Server 2010 environment
- 2480474 A Users do not receive quota warning messages after applying SP1 for Exchange 2010
- 2514820 An incoming fax message is not delivered to the recipient in an Exchange Server 2010 SP1 environment
- 2521927 Disabling the Exchange ActiveSync Integration feature for OWA does not take effect in OWA Premium clients in an Exchange Server 2010 environment
- 2528854 The Microsoft Exchange Mailbox Replication service crashes on a computer that has Exchange Server 2010 SP1 installed
- 2535289 The Microsoft Exchange Information Store service crashes occasionally when you run an antivirus application on an Exchange Server 2010 Mailbox server
- 2536313 Slow message delivery and mailbox access for journaling mailboxes on an Exchange Server 2010 server
- 2544246 You receive a NRN of a meeting request 120 days later after the recipient accepted the request in an Exchange Server 2010 SP1 environment
- 2548246 The Microsoft Exchange Information Store service crashes occasionally when a folder view is corrupted on an Exchange Server 2010 mailbox server
- 2549183 "There are no objects to select" message when you try to use the EMC to specify a server to connect to in an Exchange Server 2010 SP1 environment
- 2549289 A RBAC role assignee can unexpectedly run the Add-MailboxPermission command or the Remove-MailboxPermission command on an Exchange Server 2010 server that is outside the role assignment scope
- 2555851 A mailbox does not appear in certain address lists after you run commands on the mailbox in an Exchange Server 2010 SP1 environment
- 2559814 A user cannot add or remove delegates from a mailbox by using Outlook in an Exchange Server 2010 environment
- 2561514 Exchange Server 2003 user cannot view the free/busy information of a user in a different federated organization
- 2563860 You cannot create a new mailbox database if you already have 1000 mailbox databases in an Exchange Server 2010 environment
- 2567409 Certain free/busy messages are not replicated from an Exchange Server 2010 server to an Exchange Server 2003 server
- 2571791 Retention policies are applied to Contact items unexpectedly in an Exchange Server 2010 environment
- 2572052 Certain properties of a recurring meeting request from external email accounts are missing in an Exchange Server 2010 SP1 environment
- 2575005 You cannot start the EMC or the EMS in an Exchange Server 2010 Service Pack 1 environment
- 2578631 Certain users cannot send email messages to a mail-enabled public folder in an Exchange Server 2010 environment
- 2579172 Items that are deleted or moved still appear in the original folder when you use Office Outlook in online mode to access an Exchange Server 2010 mailbox
- 2579671 No results returned when you use the ExpandGroup method in EWS to retrieve a list of members of a Dynamic Distribution Group in an Exchange Server 2010 environment
- 2582095 The SmtpMaxMessagesPerConnection property of a send connector is not replicated to the subscribed Edge Transport server in an Exchange Server 2010 environment
- 2600835 The RPC Client Access service crashes when you delete an attachment of an item by using Outlook in online mode in an Exchange Server 2010 SP1 environment
- 2601701 The memory usage of the MSExchangeRepl.exe process keeps increasing when you perform a VSS backup on Exchange Server 2010 databases
- 2616127 "0x80041606" error code when you use Outlook in online mode to search for a keyword against a mailbox in an Exchange Server 2010 environment
- 2617126 The Store.exe process crashes when you send an email message that has attachments in an Exchange Server 2010 SP1 environment
- 2627769 Some time zones in OWA are not synchronized with Windows in an Exchange Server 2010 environment
