check the following:
-do not use space in column/table name ("ColumnID" not "Column ID")
or check the "ANSI quoted identifiers" checkbox
-is the outlook folder linked to a database VIEW?
check source of the view, if the view contains multiple tables or complex query
it is not possible to execute insert/update statements against the view (or you have to create "instead of triggers")
still problem's:
email us table/view Create script, and OutlookConnect ini file (export button on Assign Table dialog)