Use the Favorites group in Lync to keep track of those contacts you’re in touch with most frequently. Your Favorites appear by default at the top of your contacts list when you are displaying your contacts by groups. Lync automatically populates this group with the contacts you interact with most often. You can also add important contacts to Favorites manually, as follows:
Point to a contact’s picture in Lync, Outlook, or another Microsoft Office application.
Click the More Options button .
Click Add to Favorites.
You can also add contacts to your Favorites by clicking and dragging them in from other groups.
The Favorites group in Lync 2013 behaves exactly the same as “Frequent Contacts” in Lync 2010. Contacts that you have manually added to the group appear at the top of the group, and auto-suggested contacts appear at the bottom.
Note: Once you migrate your Lync contacts to Exchange 2013, you can access and manage your contacts from Lync 2013, Outlook, or Outlook Web App, and your Favorites will always stay synchronized. So for example when you add a contact to Favorites in Outlook, the contact will also appear in your Lync Favorites group. (Outlook Favorites can be found in the People peek, which appears when you hover your mouse cursor over the Outlook People module label.)