After moving a mailbox to another database you may start getting the following event log, even if the moving was sucessful:Log Name: ApplicationSource: MSExchangeIS Mailbox StoreDate: 04/01/2011 21:10:35Event ID: 10001Task Category: Background CleanupLevel: WarningKeywords: ClassicUser: N/AComputer: Description:Mailbox cleanup could not completely remove the mailbox for user ff783a8e-2dc9-4af7-bab5-435d4b841b2f (Root Fid 2-225C78C) following mailbox removal. Encountered error 0xfffffae8. Should this message continue to persist for the same mailbox, it may be indicative of a problem that requires further investigation. To stop recieving this log just dismount and mount the previous and the current database for the specified mailbox. To get rid off this problem disable NetDMA following these stepsClick Start, click Run, type regedit, and then click OK.Locate the following registry subkey, and then click it:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\ParametersDouble-click the EnableTCPA registry entry.Note If this registry entry does not exist, right-click Parameters, point to New, click DWORD Value, typeEnableTCPA, and then press ENTER.To disable NetDMA, type 0 in the Value data box, and then click OK.Source:http://support.microsoft.com/kb/951037/en-us If you are facing with the following problem when accessing the ECP:Request for URL 'https://localhost/ecp/default.aspx?rfr=owa' failed with the following error:System.TypeInitializationException: The type initializer for 'Microsoft.Exchange.Configuration.TenantMonitoring.TenantMonitor' threw an exception. ---> System.FormatException: Input string was not in a correct format.On Event Viewer you can find this error:MSExchange Control Panel - EventID 4You can fix this problem going to C:\Windows\System32 and running lodctr /r, after the command finishes run iisreset /noforce.Ussually this issue occours after update the Exchange 2010 to SP1. When you have a CAS load balance and use a virtual name to access its virtual directories, e.g. https://webmail.yourdomain.com/owa rather than the server name, you have to configure the internalURL and externalURL of all virtual directories. The problem occours if you change them through EMC, doing so you'll miss some virtual directories that can be managed only through EMS. EWS (Exchange Web Services) is one of these virtual directories and it's responsible for OOF.To configure the proper URL for EWS run the following commands on EWS:Set-webservicesvirtualdirectory Identity internalurl https:///ews/exchange.asmx externalurl https:///ews/exchange.asmx In order to configure all virtual directories' URL there is a script to help changing all virtual directories. #ChangeAutodiscoverPath.ps1#Changing InternalURL Path$urlpath = Read-Host "Type Internal Client Access FQDN starting with http:// or https://"Set-AutodiscoverVirtualDirectory -Identity * internalurl $urlpath/autodiscover/autodiscover.xmlSet-ClientAccessServer Identity * AutodiscoverServiceInternalUri $urlpath/autodiscover/autodiscover.xmlSet-webservicesvirtualdirectory -Identity * internalurl $urlpath/ews/exchange.asmxSet-oabvirtualdirectory Identity * internalurl $urlpath/oabSet-owavirtualdirectory Identity * internalurl $urlpath/owaSet-ecpvirtualdirectory Identity * internalurl $urlpath/ecpSet-ActiveSyncVirtualDirectory -Identity * -InternalUrl "$urlpath/Microsoft-Server-ActiveSync"#Changing ExternalURL Path$urlpath2 = Read-Host "Type External Client Access FQDN starting with http:// or https://"Set-AutodiscoverVirtualDirectory -Identity * externalurl $urlpath2/autodiscover/autodiscover.xmlSet-ClientAccessServer Identity * AutodiscoverServiceInternalUri $urlpath2/autodiscover/autodiscover.xmlSet-webservicesvirtualdirectory Identity * externalurl $urlpath2/ews/exchange.asmxSet-oabvirtualdirectory Identity * externalurl $urlpath2/oabSet-owavirtualdirectory Identity * externalurl $urlpath2/owaSet-ecpvirtualdirectory Identity * externalurl $urlpath2/ecpSet-ActiveSyncVirtualDirectory -Identity * -ExternalUrl "$urlpath2/Microsoft-Server-ActiveSync"#get commands to doublecheck the configget-AutodiscoverVirtualDirectory | fl identity,internalurl, externalurlget-ClientAccessServer | fl identity,AutodiscoverServiceInternalUriget-webservicesvirtualdirectory | fl identity,internalurl,externalurlget-oabvirtualdirectory | fl identity,internalurl,externalurlget-owavirtualdirectory | fl identity,internalurl,externalurlget-ecpvirtualdirectory | fl identity,internalurl,externalurlget-ActiveSyncVirtualDirectory | fl identity,internalurl,externalurlOutlook uses the Internet Explorer proxy configuration to access any Exchange web service, such as OAB, Autodiscover and EWS, so make sure the internal Client Access FQDN is in the proxy exception list.Related post:http://msunified.net/2010/01/13/configure-exchange-2010-internalurl-powershell-script To get the time in Windows domain environment synchronized on PDC server run the command below:w32tm /config /manualpeerlist: peers