Steps to change Outlook's default contact folder:
- Click Address Book in the Find group on the Home tab. Click Tools > Options in the Address Book dialogue box that appears. Choose the name of the address book you wish to use by default under When accessing the address book, show this address list first. Close the dialogue box by clicking OK.
- Right-click the Contacts folder you want Outlook to open when you launch the Contacts window when the Contacts window is active.
- Choose to Move Up In List (as many times as necessary) from the resulting context menu to move it to the top of the list.
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