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OWA status code 500 and ECP Could not load file or assembly after installing Security Update For Exchange Server 2016 CU7 (KB4045655)

OWA status code 500 and ECP Could not load file or assembly after installing Security Update For Exchange Server 2016 CU7 (KB4045655)

When you try OWA on your Exchange Server 2016 you get “Something went wrong. Your request couldn't be completed. HTTP Status code: 500.” And you get ‘Could not load file or assembly 'Microsoft.Exchange.Common, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.   The ‘reason’ that ...

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