Assume that you install version 4.0.7577.4378 of Microsoft Lync 2010 or a later version. When you sign in to Lync 2010, you may encounter multiple issues that affect the contact list. For example, you may encounter the following issues:
Assume that you click Sort by Availability inthe Display options menu. You sign out of Lync 2010, and then you sign in again. In this situation, Sort by Availability isselectedin the Display options menu. However, contacts are still sorted by displayed name.
Lync 2010 does not display all contacts in a group in the Status tab. For example, the Away group displays that 30 contacts are away. However, only 5 contacts are displayed in the group list.
Assume that you click the Status tab in Lync 2010. You sign out of Lync 2010, and then you sign in again. In this situation, the Online group is not expanded in the Status tab as expected. Additionally, multiple contacts are put in the Unknown group, even though the contacts are available.
To resolve this issue, install the following cumulative update:
2884632 Description of the cumulative update package for Lync 2010: October 2013
Lync 2010 is updated to version 4.0.7577.4378 after you install the following security update:
2791382 Description of the cumulative update package for Lync 2010: March 2013