Your status is set automatically, based on your Outlook calendar and you current Lync activity, but you can also set it manually. A similar bar appears next to each of your contacts. The colored bar on the left of your picture / generic icon represents your current status. If you have not entered a note, you will see “Click to create a personal status message” Your contacts will not see this message. Others will see this message next to your entry in their contacts list. Use this field to write a note about your day (for example, “working from home” or “in the office until 3:00 PM”). Note: Only those people you have added to your Lync contacts can see your presence. Lync determines your status automatically, based on the entries on your Office 365 calendar and your current Lync activity.
Presence is a combination of availability and willingness to meet.