Firstly, please turn off the Suggested Contacts feature: Open Outlook 2010->click File -> Options -> Contacts -> uncheck "Automatically create Outlook contacts..." and click OK.
Secondly, please delete the Address Book:
- Click File > Account Settings > Address Books.
- Select “Outlook Address Book” and click change.
- Select “Suggested Contacts” and click remove address book. In this step, you can try to delete other empty contact list if they are listed there.
- Exit and restart Outlook.
Thirdly, drag all the contacts you need in other contact list into the final contact list manually.
Please let me know the result at your convenience.
Thanks,
Colin