Room Mailbox in Exchange 2010 is not response

Problem symptom:

Working with mixed environment of Exchange 2003 and Exchange 2010.

Migrating and new creating Room mailboxes on/to Exchange 2010.

When user send meeting invitation that room is invited in it, the room is not auto accept as configured.

Problem cause:

Form mismatch.

– could be developed form that implement to organization that is not working well with Exchange 2010.


1. Fix the form that it fit the requirements of Exchange 2010 form base.

2. Interim fix: disable using form on Outlook client when sending meeting with auto accept needs (see attach screen shot).


Fault form could also cause OWA accept/decline/tentative response error (see OWA screen shot).
Additional details:
HTTP error. The server cannot fulfill the request.
Mail could not be sent.
User host address:
User: User Alias
EX Address: /o=Domain/ou=Exchange Administrative Group/cn=Recipients/cn=User name
SMTP Address: {user name}
OWA version:
Mailbox server: {Server name}

Exception type: Microsoft.Exchange.Clients.Owa.Core.OwaInvalidOperationException
Exception message: meetingRequest.UpdateCalendarItem returns null.

Call stack
Microsoft.Exchange.Clients.Owa.Core.MeetingUtilities.UpdateCalendarItem(MeetingRequest meetingRequest)

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  1. Pingback: Frei Klavier

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