I upgraded Outlook, and want to backup iPhone address book to Outlook, but unfortunately address book became empty after sync.

I guess, Outlook address book is newer than iPhone address book, so iTunes overwrite old one with new one, but new one is empty, so I lost all my contacts.

By ssh to iPhone, I noticed:

/var/mobile/Library/AddressBook/AddressBook.sqlitedb is 56320 bytes
/var/root/Library/AddressBook/AddressBook.sqlitedb is 40960 bytes

The former one is the real one, so I guess the contact information is still there but some settings prevent them to be displayed.

1. I tried to use UltraEdit to open /var/mobile/Library/AddressBook/AddressBook.sqlitedb in hex mode, there're mess and some contact name & number, but there's no any mapping between contact name and number.

2. I also tried to use SQLite3 to display all tables in /var/mobile/Library/AddressBook/AddressBook.sqlitedb, but all tables are empty.

HELP! I believe there should be some way to rollback my address book.

both files are empty... u should have created a contact on outlook before synching... and now u know.

I have to use a stupid way now:

open /var/mobile/Library/AddressBook/AddressBook.sqlitedb in binary mode, then copy all numberic strings (the 40960 bytes file has no numberic strings), then send sms to those numbers to say "hey, I lost my address book, sorry but who are you", god!

Hi everybody, who have this problem, even if this thread is old:
I have found a way to recover iPhone address book entries in case they have been wiped out - as you have correctly seen, they are still in the file. If you still have that file, give it a try, upload it here and see if your contacts get recovered:
iPhone Recovery Online - iPhone Address Book Recovery - Recover deleted iPhone contacts - iPhone Data Recovery
Feel free to give it a try - just make sure to donate if it saved your day!