I use Thunderbird for my email client and it creates LDIF file as address book. I have two books in the address book, a "friend" and a "business" one.
I tried to import the LDIF file into Windows Contact and the "friend" book was imported successfully but the "business" one failed at every attempt I made.
No error message pops up but the import window does tell me that "Error importing to Windows Contacts", and that's about it for error message. Also the progress bar hangs at about either the beginning or a quarter through. The import window function doesn't crash, I can easily close it.