I would check with Plaxo (shivers!) to see if they have any known issues
with Outlook or an update to fix the problem if known.

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Milly Staples [MVP - Outlook]
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After furious head scratching, lsarm asked:
| does anyone use plaxo? for some reason it is sync all my clients from
| plaxo as blank entries in my outlook and then when i sync again it
| changes all my contacts on plaxo to blank.