I believe that since I have installed version 1.6.6 all my contacts are double in my GSM. In Outlook and MPE I only see them once, but in my GSM I see all of my contacts twice.
I would suspect that after syncing again, i Would have them double in MPE/outllook to, but that is not te case.
OK, now I got them twice everywhere, I wil remove the duplicates manualy
I can tell the dfference because some Outlook User specific properties are not present in the duplicaties.
If you know that you have all neccesary data in Outlook then it would be the simpliest option to set the Sync-Mode to "Force Outlook -> phone". In this setting MyPhoneExplorer should delete all items which are not present in Outlook.