The status of each endpoint changes automatically in response to system events (such as logon, logoff, workstation lock and unlock, and network connectivity events), configured timeouts, scheduled meetings, and user activity.

Note The aggregate presence data that's calculated by Lync Server contains the status history of each user's endpoints if a user is signed to multiple endpoints. Last Active presence information that's provided to users should not disclose how long a user is away or offline for business reasons.However, this behavior is not enabled in some countries. Therefore, users may rely on it to remotely monitor an employee's activity. Last Active presence information may be incorrectly interpreted as reflecting the actual user's status at work.The design of the Last Active presence information has changed for the following reasons: This occurs according to the access level that the users were assigned. Last Active presence information is retrieved to satisfy individual presence inquiries and subscriptions by other users. Lync Server always calculates the Last Active time stamp during presence aggregation for each user and stores it in a database. For more information about presence information in Lync Server, see the 'References' section. This is known as 'Last Active.' The LastActive attribute returns presence inquiries only from users who have the 'Colleagues,' 'Workgroup,' and 'Friends and Family' privacy relationships. Note The Lync Server presence schema includes a method for calculating and displaying how long a user is away or offline. His article describes how to remove the LastActive attribute from the aggregation state category in Microsoft Lync Server 2010, Lync Server 2013, Skype for Business Server 2015, and Skype for Business Online. Microsoft vient de publier un nouvel article: How to remove the LastActive attribute from the aggregation state category in Lync Server 2010, Lync Server 2013, Skype for Business Server 2015, and Skype for Business Online

How to disable skype for business 2015