Downgraded Back To 4.2 & Missing Address Book

[hollywoodbound]

Hey guys! I just downgraded from 4.5 to 4.2 becuase I have to return the phone. When I use the Desktop Manager (Newest Version) and go to the advance backup setting and load the previously created .ipd file (From before I downgraded) and try to transfer my address book to the newly fresh install of 4.2 it is gray and wont let me transfer.

Is the address book in 4.5 a different storage method or something? Are they incompatible?

Thanks in advance for the help!