You do not expect to receive this error message because you have not tried to access a user's calendar.
- Outlook 2007 is running on a Windows Vista-based computer.
- You type the alias in the message field, or you select the alias from the list of cached name entries.
For example, you start to type User, and then press ENTER to select the cached User Name entry.
- The object type that corresponds to the particular alias has changed in the Active Directory directory service.
For example, the name that you type formerly represented a user account. However, the name now represents a distribution group. This issue occurs because Outlook 2007 does not perform a remote procedure call (RPC) lookup for names that you select from the cached name entries. Therefore, Outlook 2007 does not detect that the object is now a distribution group.
Note You have to do this only for user aliases with which you experience this issue.
Article ID: 927013 - Last Review: Apr 25, 2007 - Revision: 1