Our processing inbound emails is failing as Microsoft have stopped using IMAP due to authentication security issues, (I don't understand the technicalities just that it isn't working), has anyone found a solution to this issue? I think it was on the cards for a while but we weren't aware of the implications so are now stuck. We are on 5.52.2 .

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It's not that they've stopped IMAP exactly, it's that the login method can't just be username/password. You'll need to turn on OAUTH and recreate the mail account: https://docs.civicrm.org/sysadmin/en/latest/setup/oauth/#enable-the-module

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