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Outlook Web Access initialization problems on Exchange 2010 after installing any of the rollups can be fixed relatively simply by the process below.

This solution also fixes the - Couldn't find a base theme (folder name=base) issue.

Solution:

Open up a Exchange Powershell window on the affected server and type in:

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

then hit enter to run.

This program only takes a few minutes to run and replaces all the files moved by the rollup back into the correct folders so that OWA can run as normal.

Side Note:

Powershell doesn't like spaces in directory names so quote marks will be needed for "C:\Program Files" and "cd\ Exchange server"