Outlook WebApp dosnt work after update

We have now on 2 occasions experienced that our Exchange 2010 servers won’t start correct after Windows Update and Rollup packs (RU)

Today, when we meet our Exchange server’s hung at 8 of 13 updates, after 30minutes when no progress was seen, we decided to “cut” the servers.

Afterwards the rest of the patches installed flawless, BUT our OWA didn’t work it just came with this message

Couldn’t find a base theme (folder name=base)

What we did to solve this was

Open powershell and went to

C:\Program Files\Microsoft\Exchange Server\V14\Bin\.\UpdateCas.ps1 

What this little script does is it copies content from the default OWA folder to the most recent.

Extra:

Same method could properly be archived by coping the content from the original DVD

e:\SETUP\SERVERROLES\CLIENTACCESS\OWA\VERSION\ subfolders

to

C:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\14.x.x.x\ subfolders (where xxx represents most recent version)

Remember to stop default website in IIS before copy and start again when done