You can add a personal note or greeting to your Lync main window so that people can see what you’re up to. Change the note as often as you like.
To add or change a personal note:
In the Lync main window, click the note box above your name, and then type a note, such as “Working from home” or “Working on a deadline, please IM instead of stopping by.”
Tip: Outlook users, if you turn on Automatic Replies, your out-of-office message displays in the Lync note box until you turn off Automatic Replies (by clicking File tab > Automatic Replies in Outlook).