Outlook Web App Didn't Initialise

calendar Feb 21, 2013 · 1 min read · Outlook  ·
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Outlook Web App didn’t initialize. If the problem continues, please contact your helpdesk. Couldn’t find a base theme (folder name=base)

This error is caused, when the base theme for the OWA is missing in \ClientAccess\Owa\14.1.287.0\themes.

You solve this issue by running the following command in a Exchange Managment Shell:

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