I have just been told that RU4 for Exchange Server 2010 SP1 has been released to web for…

Download Link is here…
http://www.microsoft.com/download/en/details.aspx?id=26554

Issues that the update rollup resolves

  • 2537099 (http://support.microsoft.com/kb/2537099/ ) "80040154" error message when you try to configure external Client Access namespaces on an Exchange Server 2010 server

  • 2536700 (http://support.microsoft.com/kb/2536700/ ) Outlook stops responding when you try to copy a folder to its subfolder by using Outlook in online mode in an Exchange Server 2010 SP1 environment

  • 2536517 (http://support.microsoft.com/kb/2536517/ ) The Microsoft Exchange RPC Client Access service crashes intermittently on an Exchange Server 2010 server

  • 2536494 (http://support.microsoft.com/kb/2536494/ ) It takes a long time to return results when you perform an Advanced Find search on a mailbox by using Outlook in online mode in an Exchange Server 2010 SP1 environment

  • 2535648 (http://support.microsoft.com/kb/2535648/ ) The EMC takes a long time to open in an Exchange Server 2010 environment

  • 2535130 (http://support.microsoft.com/kb/2535130/ ) Performance in Outlook or in OWA decreases when you use IMAP4 to access the contacts folder in an Exchange Server 2010 environment

  • 2535105 (http://support.microsoft.com/kb/2535105/ ) There is no option to disable the Availability service in an Exchange Server 2010 environment

  • 2533543 (http://support.microsoft.com/kb/2533543/ ) Event ID 2153 is logged on each database availability group member in an Exchange Server 2010 environment

  • 2533538 (http://support.microsoft.com/kb/2533538/ ) You cannot look up the free/busy information of a user who is located on an Exchange Server 2010 organization from another Exchange Server 2010 organization

  • 2533451 (http://support.microsoft.com/kb/2533451/ ) A RBAC role assignee can unexpectedly run the "Update-FileDistributionService" command on an Exchange Server 2010 server that is outside the role assignment scope

  • 2519359 (http://support.microsoft.com/kb/2519359/ ) "Changes to the rule cannot be saved." error message when you try to create a reply rule by using Outlook in an Exchange Server 2010 environment

  • 2518850 (http://support.microsoft.com/kb/2518850/ ) You cannot receive email messages on a mobile phone by using ActiveSync in an Exchange Server 2010 environment

  • 2517088 (http://support.microsoft.com/kb/2517088/ ) Public folder conflict resolution does not work as usual in an Exchange Server 2010 environment

  • 2515259 (http://support.microsoft.com/kb/2515259/ ) "The items could not be copied." error message when you run the Get-MailboxSearch cmdlet in an Exchange Server 2010 SP1 environment

  • 2514709 (http://support.microsoft.com/kb/2514709/ ) Event ID 1001 after you successfully the install Exchange Server 2010 Unified Messaging server role

  • 2514574 (http://support.microsoft.com/kb/2514574/ ) The Exchange RPC Client Access service crashes in an Exchange Server 2010 environment

  • 2513723 (http://support.microsoft.com/kb/2513723/ ) The "New-MailboxImportRequest" cmdlet does not import all messages in a .pst file in the ANSI format in an Exchange Server 2010 environment

  • 2512023 (http://support.microsoft.com/kb/2512023/ ) "GetUserOofSettings", "SetUserOofSettings" and "GetUserAvailability" operations do not support Exchange Impersonation on the Exchange Server 2010 SP1 schema

  • 2511897 (http://support.microsoft.com/kb/2511897/ ) You cannot send an email message to a mailbox for a brief period when you move the mailbox by using online move in an Exchange Server 2010 environment

  • 2507463 (http://support.microsoft.com/kb/2507463/ ) You cannot move a mailbox that contains a corrupted Search Folder in an Exchange Server 2010 environment

  • 2506820 (http://support.microsoft.com/kb/2506820/ ) The free/busy information does not display of a user whose mailbox is located on an Exchange Server 2003 server

  • 2506049 (http://support.microsoft.com/kb/2506049/ ) The hierarchy of a new public folder database on an Exchange Server 2010 SP1 server is not replicated

  • 2505968 (http://support.microsoft.com/kb/2505968/ ) The EdgeTransport.exe process crashes when you apply a rule that contains a bad email address in an Exchange Server 2010 environment

  • 2504453 (http://support.microsoft.com/kb/2504453/ ) You cannot retrieve statistical information about a public folder by using the "Get-PublicFolderStatistics" cmdlet in an Exchange Server 2010 SP1 environment

  • 2503337 (http://support.microsoft.com/kb/2503337/ ) Comments of your meeting response message is missing when you decline a meeting request in an Exchange Server 2010 environment

  • 2501070 (http://support.microsoft.com/kb/2501070/ ) A RBAC role assignee can stop queue processing on an Exchange Server 2010 Hub Transport server or an Exchange Server 2010 Edge Transport server that is outside the role assignment scope

  • 2500903 (http://support.microsoft.com/kb/2500903/ ) A space is missing in the subject line of a "Tentative" meeting response in an Exchange Server 2010 environment

  • 2500648 (http://support.microsoft.com/kb/2500648/ ) "There are no items to show in this view." error message when you try to view a folder in Outlook in an Exchange Server 2010 environment

  • 2495167 (http://support.microsoft.com/kb/2495167/ ) You cannot recover a deleted public folder by using Outlook or MFCMAPI in an Exchange Server 2010 environment

  • 2495010 (http://support.microsoft.com/kb/2495010/ ) The EdgeTransport.exe process consumes 100% CPU usage on an Exchange Server 2010 Edge Transport server or an Exchange Server 2007 Edge Transport server

  • 2493393 (http://support.microsoft.com/kb/2493393/ ) You cannot use ECP to perform a wipe on a mobile phone in an Exchange Server 2010 SP1 environment

  • 2492068 (http://support.microsoft.com/kb/2492068/ ) "The item cannot be saved to this folder." error message when try to post an item to a mail-disabled public folder in an Exchange Server 2010 SP1 environment

  • 2491354 (http://support.microsoft.com/kb/2491354/ ) You cannot view the free/busy information of users in a mixed Exchange Server 2007 and Exchange Server 2010 environment

  • 2490134 (http://support.microsoft.com/kb/2490134/ ) A deferred delivery email message is not delivered by using Outlook 2007 in online mode in an Exchange Server 2010 environment

  • 2489964 (http://support.microsoft.com/kb/2489964/ ) An update enables range 0x-0x1F characters in the display name of an Exchange Server 2010 user account

  • 2489938 (http://support.microsoft.com/kb/2489938/ ) The "Connect-ExchangeServer" function does not change the target Exchange server in Exchange Server 2010

  • 2489130 (http://support.microsoft.com/kb/2489130/ ) A RBAC role assignee can unexpectedly change mailbox properties that are outside the management role group scope in an Exchange Server 2010 environment

  • 2488643 (http://support.microsoft.com/kb/2488643/ ) Outlook downloads duplicated POP3 email messages in an Exchange Server 2010 environment

  • 2479188 (http://support.microsoft.com/kb/2479188/ ) The iCal parts of an email message contain invalid entries when they are sent from an Exchange Server 2003 mailbox to an Exchange Server 2010 mailbox

  • 2477273 (http://support.microsoft.com/kb/2477273/ ) The DomainController parameter does not work when you use the "MoveMailbox.ps1" script to move mailboxes in an Exchange Server 2010 environment

  • 2471964 (http://support.microsoft.com/kb/2471964/ ) A NDR is sent to the sender when you move an email message to a personal folder file in an Exchange Server 2010 SP1 or a later version environment

  • 2467619 (http://support.microsoft.com/kb/2467619/ ) A user who manages a distribution group cannot remove another user whose mailbox is disabled in an Exchange Server 2010 environment

  • 2465292 (http://support.microsoft.com/kb/2465292/ ) "MAPI_E_FAILONEPROVIDER (0x8004011D)" error message when you access an Exchange Server 2010 mailbox by using a MAPI application

  • 2446908 (http://support.microsoft.com/kb/2446908/ ) ESE event descriptions are missing in Event Viewer when the Eseutil utility is called on an Exchange Server 2010 SP1 server

  • 2394554 (http://support.microsoft.com/kb/2394554/ ) An email message is not delivered if it contains unsupported encoded characters in the subject line in an Exchange Server 2010 environment

  • 2491951 (http://support.microsoft.com/kb/2491951/ ) You cannot install Exchange Server 2010 SP1 if the NetBIOS domain name of the domain controller contains an ampersand (&) character

  • 2507066 (http://support.microsoft.com/kb/2507066/ ) Administrator audit logging is disabled unexpectedly during an Exchange Server 2010 SP1 installation

More information available here ..
http://support.microsoft.com/?kbid=2509910

Neil Johnson [neiljohn@microsoft.com]
Senior Consultant, Microsoft Consulting Services, UK