Exchange 2010 Database Issues

I have an exchange server 2010  with 2 databases and a exchange server 2003.  The servers have been running for a while with out issues.  I have begun to move users from and existing 2003 server.  all users I placed in DB 1 work find, all users placed in DB 2 does not. Both DB's are mounted and display that they are healthy.   Users in DB2 outlook says it is connected but unable to send or receive mail.  No errors were reported failed or completed /w errors.
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Simon Butler (Sembee)ConsultantCommented:
Have you tried moving a user who gets the problem to a new database, as I suggested?

Simon Butler (Sembee)ConsultantCommented:
Not really enough information to go on.
Would tend to suggest a database problem, so as you can have multiple databases I would just create a new one, move some test users to the new database. If they work, trash the old one.

cbenson7Author Commented:
Url: https://xxxxxxx:443/owa/
OWA version:

Exception type: System.ArgumentNullException
Exception message: Value cannot be null. Parameter name: organizationId

Call stack

Microsoft.Exchange.Data.Directory.ScopeSet.GetOrgWideDefaultScopeSet(OrganizationId organizationId, QueryFilter recipientReadFilter)
Microsoft.Exchange.Data.Directory.ADSessionSettings.FromOrganizationIdWithoutRbacScopesServiceOnly(OrganizationId scopingOrganizationId)
Microsoft.Exchange.Clients.Owa.Core.Utilities.CreateADRecipientSession(Boolean readOnly, ConsistencyMode consistencyMode, SmtpDomain smtpDomain)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.PrepareRequestWithoutSession(OwaContext owaContext, UserContextCookie userContextCookie)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.AcquireAndPreprocessUserContext(OwaContext owaContext, HttpRequest request)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.InternalDispatchRequest(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.RequestDispatcher.DispatchRequest(OwaContext owaContext)
Microsoft.Exchange.Clients.Owa.Core.OwaRequestEventInspector.OnPostAuthorizeRequest(Object sender, EventArgs e)
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
cbenson7Author Commented:
Getting the error message above
cbenson7Author Commented:
I found the answer.  The 2k10 exchange storage fell below the recommend amount and stopped passing mail.
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