GeniusConnect is using primary key (defined by the user), the primary key Column name(s) and value(s) are stored in
Outlook Item custom-fields OCPRIMNAMES, OCPRIMVALUES for every item Loaded/stored from/to database.
These custom fields are visible in Outlook till version 3.0.0.1.
Version 3.0.0.1SP1 stores these custom-fields only on MAPI level.