Hi There,
I am having massive issues with my Exchange Server.
I have 2 Nodes, one has CAS and Mailbox Roles, the other just Mailbox.

I "upgraded" the CAS server to CU7 without any errors / issues.

Once I had restarted, nothing worked any more..  I couldn't access ECP, OWA, Powershell, Autodiscover or get outlook to connect.

I managed to get Powershell working, but changing the physical directory to "C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\PowerShell" from "C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\PowerShell"

But for the life of me I cannot get ECP or OWA working (haven't even tried anything else)!

I am getting a load of Events with ID 1003.

The only error I am getting is:

Server Error in '/ecp' Application.

---

Method not found: 'Boolean Microsoft.Exchange.Net.Wopi.WopiRequestPathHandler.IsWopiRequest(System.Web.HttpRequest)'.

[MissingMethodException: Method not found: 'Boolean Microsoft.Exchange.Net.Wopi.WopiRequestPathHandler.IsWopiRequest(System.Web.HttpRequest)'.]
   Microsoft.Exchange.HttpProxy.ProxyModule.AllowAnonymousRequest(HttpRequest httpRequest) +0
   Microsoft.Exchange.HttpProxy.ProxyModule.OnAuthenticateInternal(HttpApplication httpApplication) +51
   Microsoft.Exchange.HttpProxy.<>c__DisplayClass5.<OnAuthenticateRequest>b__4() +447
   Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(TryDelegate tryDelegate, FilterDelegate filterDelegate, CatchDelegate catchDelegate) +40
   Microsoft.Exchange.HttpProxy.Diagnostics.SendWatsonReportOnUnhandledException(MethodDelegate methodDelegate) +408
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165

Which is almost meaningless...  but maybe someone out there has some idea?

Unfortunately this is very urgent for me a these are production servers and currently there is no email for my company.

So Please please please can someone help.

I have tried many many many things from various sites, and so far nothing has worked.

Thanks,

-Tim