Outlook.com (and old Hotmail) shows up a lot in hybrid setups: people reply from Gmail but keep the @outlook or @hotmail address because “everyone has it.” Mail Fetcher hid that mess. As POP goes away, the mess returns.
Three common friction points
- Modern auth: app passwords, OAuth, odd lockouts.
- Forwarding to Gmail: sometimes works, sometimes lands in spam.
- Send mail as from Gmail: a separate problem from fetching.
To read the mailbox, IMAP in the Gmail app or a desktop client is usually the path Microsoft expects. To read it inside the same Gmail web inbox, you need sync.
If that is your case, GetPopMail can connect the source and leave messages labeled in Gmail. Keep “receive” and “send as” mentally separate: they are two setups, and you should test them one at a time.