We have bought Office 365 from Microsoft & hosting mailboxes at Microsoft's data center + using Lync.
Since last 5~6 days, users are unable to find employees using search option in Lync. Also photos of employees are no more displaying. This issue is affecting more than 50 users so on I guess it's not an issue of individual PC. I tried reconfiguring Office 365,rebooting PC but no use.
Raised ticket to Microsoft but response is too slow.
Regards,
Amey.