Exchange Online Cuts Off Some Clients in Oct. 2020

  • Exchange Online will cut off basic authentication Oct. 13, 2020 for many protocols.
  • The cutoff will prevent access by some mail clients.
  • Migrations from third-party mail systems, administrative scripts, and mobile clients are most likely to be affected.
  • Exchange Server and recent versions of Outlook and are not affected.
  • Microsoft has promised updates that could limit the impact.

Exchange Online will cut off basic authentication Oct. 13, 2020 for the following protocols:

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