Hey guys. i searched for this but didnt find anything to exactly answer my question. its pretty simple...before formatting my laptop i went to the data folder in outlook 07 and i copy pasted my outlook data file into my other partition(at the time i thought it was a .pst file???) so today when i tried to merge the new oen and old one together it wont let me. from what i read it says outlook can only merge .pst with .pst. but i have an .ost and .pst. and i really wouldnt want to use a thrid party program. any suggestions fellow computer guru's?