1. Open Lync by going to the Start button, and opening “All Programs,” then look in the Microsoft Office 2013 Folder for the Lync icon.
2. When Lync is launched, click on the gear icon to open the pop out menu
3. Choose Tools
4. Choose Options
5. Go to the “Personal” page and uncheck the top box to keep Lync from starting at all when you reboot. To have Lync automatically sign in and run but not open on the screen, leave the first box checked and uncheck the second box.