Hi,

Our Exchange 2013/2007 coexistence environment is set up and all is working apart from this:

Mailbox A has full permissions to Mailbox B. Mailbox A is migrated to Exchange 2013, but Mailbox B remains on Exchange 2007. If I login to Outlook Web App 2013 as Mailbox A and then "Open another mailbox..." and select Mailbox B, a new window opens up saying "HTTP 500 Internal Server Error". The URL it is trying is : https://webmail.ourdomain.com/owa/MailboxB@ourdomain.com/?offline=disabled

( I can open Mailbox A in Outlook 2010 and do "Open Other users's folder.." and Mailbox B opens up just fine. )

Our legacy CAS server's External and Internal URLs are set to : https://legacy.ourdomain.com/owa

and the Exchange 2013 CAS server's External and Internal URLs are set to : https://webmail.ourdomain.com/owa

We have FBA enabled on both the E2K7 and E2K13 OWA

In the IIS logs:

2015-03-02 16:36:50 <E2K13_IP> POST /owa/service.svc action=SubscribeToNotification&UA=0&ID=-25&AC=1&CorrelationID=c2899211-568d-4da4-a163-351a8621c9fd_142531419466924;&cafeReqId=7ffae082-a96f-42fd-85f8-bf23775ed5de; 443 ourdomain.com\MailboxA <LoadBalancer_IP> Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.1;+WOW64;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+Media+Center+PC+6.0) https://webmail.ourdomain.com/owa/#path=/mail 200 0 0 109
2015-03-02 16:36:50 <E2K13_IP> GET /owa/ offline=disabled&CorrelationID=<empty>;&cafeReqId=7c8e137f-cdb7-4449-9cb8-f36f94539244; 443 ourdomain.com\MailboxA <LoadBalancer_IP> Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.1;+WOW64;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+Media+Center+PC+6.0) - 500 0 0 265

In the OWA HTTP Proxy logs:

2015-03-02T16:36:50.096Z,7c8e137f-cdb7-4449-9cb8-f36f94539244,15,0,913,7,,Owa,webmail.ourdomain.com,/owa/,,FBA,True,ourdomain.com\MailboxA,ourdomain.com,Smtp~MailboxB@ourdomain.com,Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0),<LoadBalancer_IP>,<Exchange2013ServerName>,500,,ServerNotFound,GET,,,,,ExplicitLogon-SMTP-Header,,,,0,,,,40,9,,0,7;,7,,0,7,,0,46.8643,0,,,,,,,,,1,10,0,,10,,50,50,?offline=disabled,,BeginRequest=2015-03-02T16:36:50.049Z;CorrelationID=<empty>;ProxyState-Run=None;ServerLocatorRefresh=beebf732-0f99-47a0-9f36-d266573f1510;RefreshingCacheEntry=CacheEntry(BackEndServer <Exchange2007ServerName>.ourdomain.com~1912832083|ResourceForest |LastRefreshTime 2015-03-02T16:01:29.3265514Z|IsSourceCachedData False);ProxyState-Complete=CalculateBackEnd;EndRequest=2015-03-02T16:36:50.096Z;I32:ADS.C[<DC_Name>]=1;F:ADS.AL[<DC_Name>]=6.6401;I32:ATE.C[<DC_Name>.ourdomain.com]=1;F:ATE.AL[<DC_Name>.ourdomain.com]=0,HttpProxyException=Microsoft.Exchange.HttpProxy.HttpProxyException: The server <Exchange2013ServerName>.ourdomain.com was not found in the topology. ---> Microsoft.Exchange.Data.Storage.ServerNotFoundException: The server <Exchange2013ServerName>.ourdomain.com was not found in the topology.    at Microsoft.Exchange.Data.Storage.ServiceTopology.GetSite(String serverFullyQualifiedDomainName)    at Microsoft.Exchange.Data.ApplicationLogic.Cafe.HttpProxyBackEndHelper.GetServiceTopologyWithSites(String serverFqdn  ServiceTopology topology)    at Microsoft.Exchange.Data.ApplicationLogic.Cafe.HttpProxyBackEndHelper.GetE12ExternalUrl[ServiceType](BackEndServer mailboxServer)    at Microsoft.Exchange.HttpProxy.OwaProxyRequestHandler.GetE12TargetServer(BackEndServer mailboxServer)    at Microsoft.Exchange.HttpProxy.BEServerCookieProxyRequestHandler`1.GetDownLevelClientAccessServer(AnchorMailbox anchorMailbox  BackEndServer mailboxServer)    at Microsoft.Exchange.HttpProxy.LatencyTracker.GetLatency[T](Func`1 operationToTrack  Int64& latency)    at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.InternalOnCalculateTargetBackEndCompleted(TargetCalculationCallbackBeacon beacon)    at Microsoft.Exchange.HttpProxy.ProxyRequestHandler.<>c__DisplayClass3b.<OnCalculateTargetBackEndCompleted>b__3a()    --- End of inner exception stack trace ---;

Hoping that somebody can help ?

Thanks

Why not move that mailbox to Exchange 2013?

We're just about to start mailbox migrations for the whole company, so while we will try to move groups of users and their delegates/sharers at the same time, there is a possibility that some people may need to access legacy mailboxes for a short period of time.

You'll want to ensure as best you can that workgroups that share access are moved together.

Hi Ansev,

Thank you for your question.

By my testing, user who was migrated to Exchange 2013 cannot access mailbox on Exchange 2007 with 500 error, although user account have Full Access Permission to mailbox on Exchange 2007.

I suggest we migrate account which has Full Access Permission for other user  to Exchange 2013.

If there are any questions regarding this issue, please be free to let me know. 

Best Regard,

Jim