Hi I remember that Microsoft changed the authentication. So to use imap or pop with a non MS app (2 factor auth) you have to set an application password for that account. You can do this in the account properties

Invalid Operation

Server replied with following exception: b'* OK The Microsoft Exchange IMAP4 service is ready. [UABOADIAUABSADAAMQBDAEEAMAAwADMAOAAuAEkATgBEAFAAUgBEADAAMQAuAFAAUgBPAEQALgBPAFUAVABMAE8ATwBLAC4AQwBPAE0A]'

still

Here is the official Odoo Documentation:
https://www.odoo.com/documentation/16.0/applications/general/email_communication/email_servers.html

Hi,

Try referring the blog on How to Configure Outgoing & Incoming Mail Servers in Odoo 18: https://www.cybrosys.com/blog/how-to-configure-outgoing-and-incoming-mail-servers-in-odoo-18

Hope it helps