Outlook 0x800CCC90 and 0x800CCC92: POP3 Server Rejects Your Username or Password
Outlook 0x800CCC90 appears when a POP3 logon is refused. Clear the stale stored credential, check the username format, and move the mailbox to modern authentication.
Outlook 0x800CCC90 appears when a POP3 logon is refused. Clear the stale stored credential, check the username format, and move the mailbox to modern authentication.