After you upgrade to Microsoft Exchange Server 2016 CU7, you may notice that the Exchange mailbox transport delivery service is unable to start. Additionally, transport service (edgetransport.exe) crashes and returns the following error message:
Source: MSExchange Common
Message: Watson report about to be sent for process id: xxxxx, with parameters: E12IIS, c-RTL-AMD64, 15.01.1261.035, edgetransport, mscorlib, M.W.RegistryKey.CreateSubKeyInternal, System.UnauthorizedAccessException
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.