Please note: If you set the birthday for a contact its not possible to delete it. The only way is to delete the old contact and make a new one without birthday (thats SonyEricsson
By the way - i have a new hidden treasure implemented:
Add the following lines to the general.ini (under [Main]):
Organizer_Standardfile=C:\calendar.vcs
Phonebook_Standardfile=C:\contacts.vcf
Now start MPE and look at the toolbars.
I called it "Quick Import", maybe interesting for a geek like you