Hello, the installation fails with this error: "Messaging API and Collaboration Data Objects 1.2.1 cannot be installed with this version of Microsoft Exchange " Outlook has never been installed on this clean installation of the windows Small Business server 2008. (exchange 2007)

Hi, If you already have another version of MAPI on the box, you cannot install the download (and/or - if you managed to get the download to install, this would be an unsupported environment). Regards. Shafaquat Ali.M.C.I.T.P Exchange 2007/2010, M.C.I.T.P Windows Server 2008, M.C.T.S OCS Server 2007 R2, URL: http://blog.WhatDoUC.net Phone: +923008210320

Hi If you already have another version of MAPI on the box, you cannot install the download (and/or - if you managed to get the download to install, this would be an unsupported environment). Hello, Thanks for your reply. How can I see that? We don't know about another version of Mapi installed. regards, Ahuibers

Hi, Before you re-install Microsoft Exchange Server MAPI Client and Collaboration Data Objects 1.2.1 , I recommend you to run the cmmdlt below to give full permission on the account that you used to perform backup. “get-mailbox -database "Server\Storage group\Mailbox database" | add-mailboxpermission -user admin -accessright fullaccess-inheritancetype all" If the problem still persists kindly let us know. Regards. Shafaquat Ali. M.C.I.T.P Exchange 2007/2010, M.C.I.T.P Windows Server 2008, M.C.T.S OCS Server 2007 R2, URL: http://blog.WhatDoUC.net Phone: +923008210320

Hello, Thanks for your reply again. I have done that powershel command. Permissions are now set. It doesn't help for the problem we have. Mapi32.dll Properties: Name: Extended MAPI 1.0 for Windows NT Version: 1.0.2536.0 - 6.0.6000.16386 date 11/2/2006 regards, Ahuibers

We have solved the problem: For a 64-bit operating system, an ExchangeMAPI key should now exist under HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Clients\Mail. Delete the Outlook registration [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Clients\Mail\Microsoft Outlook] Outlook has not been installed, but the register key was need to be deleted. regards, Ahuibers