This article describes how to troubleshoot the following Skype for Business Online (formerly Lync Online) issues:
- Contacts seem to be offline in Skype for Business, or they have a status of "presence unknown."
- You can't search the address book in Skype for Business.
- Skype for Business Online contacts are lost or missing, or the contacts list isn't updated.
Article ID: 2435699 - Last Review: Dec 26, 2016 - Revision: 1