owa gives error http 500 or Blank screen

when we logon to the OWA we are allowed to logon but then it comes up with either a blank screen or an http: 500 error
Alan DuckAsked:
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VB ITSConnect With a Mentor Specialist ConsultantCommented:
Did some updates install on the server recently? Try running the UpdateCas.ps1 script which can be found in the C:\Program Files\Microsoft\Exchange Server\V14\Bin directory.

- Open the Exchange Management Shell
- Type in cd "C:\Program Files\Microsoft\Exchange Server\V14\Bin"
- Type .\UpdateCas1.ps1 then hit Enter
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