I was able to resolve the same issue. The symptoms and solution for me is as follows:
Setup:
- In Mac Mail, I had my Outlook.com email account setup as IMAP, similar to other IMAP accounts
- The servers, ports and SSL settings were auto-selected my Mac Mail
- My mail servers were auto selected to imap-mail.outlook.com and smtp-mail.outlook.com
Symptoms:
- After working for several years, suddenly, Mac would show a message to re-type the password for the Outlook.com account
- If the password, which was unchanged for over 6 months, is supplied, connection attempt fails and a message says "Unable to verify account name or password"
Solution:
- These were failed attempts: tried all of these and failed -
- Turning IMAP off/on from outlook.com,
- Turning off POP from outlook.com,
- Removing the outlook.com account from Mac and trying to add it again,
- Using 'outlook.office365.com' as the incoming IMAP server
- What worked for me: Then, I tried adding the account in Mac Settings > Internet Accounts as "Microsoft Exchange"
- Mac Settings > Internet Accounts > Add Account ...
- Select "Microsoft Exchange"
- Enter email and password
- The rest was auto configured by Mac
- Select which services I want connected (I only chose "Email")
- Once completed, it connected successfully and now receiving/sending emails
For now, this has been working and I thought I would share this for others to try.
MM
EDIT: Thanks to Jennifer Mathews2's post on June 29, 2024 and George Christides' reference of it on Jul 31, 2024