Exchange 2010 SP2 RU1 & RU2 breaks OWA



Exchange 2010 Service Pack 2 Rollup 1 has broken some cas servers. I know it sounds crazy that an update direct from Microsoft would do this.


I have been working on a number of Exchange 2010 projects recently and both projects were using hardware load balancers. So i started to test the internal owa url on all of my cas servers and on some of the servers – the internal owa url wasn’t working. So if that isn’t working then OWA definitely wont work on that server. So to fix it is quite simple.

On the server that is having a problem. Delete the themes folder from both of these locations.

C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\14.2.283.3
C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\14.2.247.5

Once they are deleted then copy and paste themes folders from a healthy cas server back where they should go on the problematic server.

If the above steps dont work. Go to a server that is working ok and export the following regkeys and then add them to the server that had the problem and re-apply the rollup and problem will be solved.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns\Microsoft.Exchange.Management.PowerShell.E2010]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns\Microsoft.Exchange.Management.PowerShell.Setup]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PowerShell\1\PowerShellSnapIns\Microsoft.Exchange.Management.Powershell.Support]

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