In a Microsoft Exchange Server 2007 environment, when you send a meeting request that includes a custom form, the meeting request is displayed as a common appointment. In other words, the custom form is not used in the recipients' calendar.
This problem occurs because Exchange Server 2007 does not copy the dispidCustomFlag property from the meeting request.
To resolve this problem, install the following update rollup:
972076 Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the dispidCustomFlag property, visit the following Microsoft Web site: