The UserDisplay property returns the MAPI display name of the user associated with an item.
Access and Attendee objects
String
Read/write
In the context of a Schedule object, the UserDisplay property returns the display name of the currently logged-on Schedule+ user. In the context of an Attendee item, it returns the display name of the attendee.
Note You should always set the UserDisplay, UserEntryId, and UserSearchKey properties. Failing to set all three of these properties can lead to unexpected results.
UserEntryId
UserName
UserSearchKey