• Lock the computer, Select Ctrl + alt + delete , but this will not lock your Office365 session. 

  • To lock your Office365 session and your computer, Select use ctrl + alt + end, then select Lock this computer

  • To switch between open programs, alt + tab won’t work (it just switches between the Office365 and generic logon). Instead use alt + insert

  •  
  • A full list of shortcut keys available here: https://msdn.microsoft.com/en-us/library/aa383500(v=vs.85).aspx