A rule has most likely been created (either by you or someone else) for one
or more fields whether standard or custom which is preventing the field to
be saved (Outlook is not big on identifying which field rule is broken).
Karl
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Karl Timmermans - The Claxton Group
ContactGenie - Importer 1.3 / DataPorter 2.0 / Exporter
"Power contact importers/exporters for MS Outlook '2000/2007" http://www.contactgenie.com