Every click counts, right? Control which Contacts folder Outlook opens by default and eliminate a few unnecessary clicks from your routine.
The solution is so simple: Make your favorite Contacts folder the default. Then, when you launch Contacts, Outlook will open the folder you really need, not the out-of-the-box Contacts folder. That statement is just a bit deceptive though, because you don't actually change a default setting. Rather, you usurp the default folder's position, as follows:
With the Contacts window open, right-click the Contacts folder you want Outlook to open when you launch the Contacts window.
From the resulting context menu, choose Move Up In List (as many times as necessary) to position it at the top of the list.
When you launch Contacts, Outlook opens the folder at the top of the list. By moving the folder you use the most to the top, you can eliminate a few annoying clicks. Admittedly, this isn't a huge timesaver, but it's one of those shortcuts users don't take advantage of, mostly because they don't realize they can!