Presence information is not shown for some Lync users on the SharePoint site:
CauseIf SharePoint service was assigned to a service user before Lync service, the integration for this user may not work as expected.
ResolutionIn order to prevent this issue from occurring, always add Lync service to a user before adding SharePoint service.
To fix the issue for an existing user:
- Log in to the SharePoint site as the administrator. Expand the Site Actions list and select Site Settings -> People and Groups.
- Open the settings of the required user. Note that the "SIP Address" field is empty. Click on Edit Item:
- Populate the SIP Address field with the user's SIP address and click Save:
After these steps are completed, the user's presence information should be properly shown: