•  Follow Step 1 in this article to help with Outlook connectivity issues to Office365
https://support.office.com/en-za/article/Set-up-Office-2010-desktop-programs-to-work-with-Office-365-for-business-3324b8b8-dceb-45e2-ac24-c642720108f7?ui=en-US&rs=en-ZA&ad=ZA
  • Make sure to restart your computer after the installation is complete