New server, new Windows Server 2003 Standard x64 install, and obviously a new Exchange 2007 install. Best Practices showed all is well. There's an existing Exchange 2003 server from which we will migrate. IIS had minor difficulties installing. During the Application Role installation, it couldn't find iisback.vbs or iisback.vb_ on the CD. The only one of either I was able to find was in the AMD64 folder; this is an Intel Xeon box. Possible problem? Installation stopped with: Client Access RoleFailed Error:An error occurred while creating the IIS virtual directory 'IIS://foo.domain.com/W3SVC/1/ROOT/owa' on 'FOO'. Unexpected Error Elapsed Time: 00:00:19 Mailbox RoleCancelled Event viewer reports: Event Type:ErrorEvent Source:MSExchangeSetupEvent Category:Microsoft Exchange Setup Event ID:1002Date:6/8/2007Time:1:44:41 PMUser:N/AComputer:FOODescription:Exchange Server component Client Access Role failed. Error: Error:An error occurred while creating the IIS virtual directory 'IIS://foo.domain.com/W3SVC/1/ROOT/owa' on 'FOO'. Unexpected Error For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Link provided takes me to Calendar item corruption. Help?

Hi Steve, I am also getting the same error for a new install (on a similar configuration). Did you get any reply / solution to this problem. Could you please share the same with me?

XEON also uses AMD64 so that is no problem You might need to uninstall IIS completely and reinstall IIS before you install Exchange Deli

Hi All, I'm getting a similar error when setting up a freash Exchange2007 box. I haven't found anything that works yet. Diid anyone finnaly figure out what Exchange2007 was complaining about? Seems strange that Microsoft hasn't posted something more about this since it appears to be happening to more than just a couple of installations. Any help to solve this woulf be gratly appriciated. Thank You Will

Im having the same problem here. Someone please post anything they find soon. Thanks. Here is Error: Client Access RoleFailed Error:An error occurred while creating the IIS virtual directory 'IIS://NYSERVER.test.com/W3SVC/1/ROOT/owa' on 'NYSERVER'. Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) Elapsed Time: 00:04:08