I have a weird problem with Exchange 2007 SP3 Roll Up 11.
When sending a meeting request internally, Exchange works as expect by prompting the attendee to Accept etc. However as soon as an external contact is added, the meeting request is sent as an email to both the external and internal attendees.
A far as I can tell this has only started helping since I had to update are AD schema as stated in Microsoft Knowledge KB2457729
as we couldn’t add a Receive Connector for GFI FaxMaker upgrade.
I have ruled out that Outlook is the problem, as I have the same issue when creating meeting requests on my iPhone.
Any pointers in the right direction would be appreciated.