FJ Software

You could switch back to the old Outlook interface to check if it works better:
-> Start-Run-%appdata%\MyPhoneExplorer\general.ini-OK
-> add below [Main] a new line: UseOutlookObjectModel=1
-> save the file
-> sync again This helped in my case. Now almost 50 birthdays get moved in the phote to ...

I experience same problem syncing birthday appointments between my HTC DisireS (Android 4.0.4, MPE Client 1.0.23) and PC with Windows7 (Outlook 2007, MPE 1.8.4). Birthday entries in Oulook have been automatically created in Outlook with correсt data, but after syncing they appear in phone moved back ...