Mail Retrieve Software for Microsoft 365

As Microsoft 365 is moving to Oauth2, and Fetchmail didn't release a stable version supporting it (only an Alpha on the version 7, but not solid), my organization is looking for a IMAP mail retrieve service like Fetchmail to: Save on the disk mail data like: header body attachments This service/daemon should run on a linux server. I'm trying to figure out if it's possible to use Getmail, I can't find a configuration for Microsoft 365, only for Gmail. ** UPDATE ** I've found an application called Mutt, and I'm following this documentation: mutt oauth2 But I get no authenticators available for now, I bet I'll miss something in the muttrc config, or in the Azure configurations. My plans is to use this library, also: mutt wizard expecially for the isync integration. I don't have experience with MailDir, but probably when I have the backups into my disk it would be easier to get mail info + attachements. Anyone that have experience with this? ** 2 UPDATE ** I opened an issue on Mutt Github. I can't find a way to save Outlook Mail locally.