Close Skype for Business (SfB) or Lync completely by right-clicking the SfB / Lync icon in the Windows System Tray and selecting Exit.NOTE: Depending on the Windows Explorer settings, the SIP profile folder may be hidden, if you are unable to navigate to the path listed for your version of the Skype for Business or Lync client you will need to set Windows Explorer to Show Hidden Files and Directories prior to completing the steps below. To resolve the issues listed above, use the following guidance to delete the SIP profile for the affected user. “Skype for Business Server is Temporarily Unavailable” or “Lync Server is Temporarily Unavailable” errorsĪdditionally, it could be good practice to delete the SIP profile when switching to a new Skype for Business (Lync) platform as connection information can be cached.