Forum Discussion

MatoBoost's avatar
MatoBoost
Tin Contributor
Jul 02, 2026

New Outlook: "Changing the ImapRemoteServerInfo is not allowed" after host migration

Hi everyone! I've migrated my domain/mailbox from one IMAP host to another in May. It cannot be added to New Outlook for Windows — fails instantly with INVALID_CREDENTIALS INTERACTION_REQUIRED, even...
office 365
outlook for windows
RobertSparnaaij's avatar
RobertSparnaaij
MVP
Oct 05, 2026

Hi Lyubo​,
Yes, I'm currently still taking Private Messages for this topic to escalate the mailboxes to the Outlook Team for a reset.

lorraineb's avatar
lorraineb
Occasional Reader
Nov 01, 2026

I am experiencing a similar issue with New Outlook for Windows.

My email address, mailto:email address removed for privacy reasons, was previously migrated between hosting providers.

My current provider, CyberCircuit, has confirmed that Microsoft's cloud servers successfully connect to and authenticate my mailbox. However, New Outlook fails to complete the account setup and reports Error: UNKNOWN.

I have already verified the server settings and attempted reinstallation and repair.

Microsoft live support declined further investigation because my computer runs Windows 10.

I noticed that Robert Sparnaaij previously assisted other users with cloud-side IMAP account resets.

Could you please advise whether my account can be investigated for a stale ImapRemoteServerInfo association and how I can request a supported reset?

I understand that a cloud mailbox reset could remove data stored only in Microsoft's cloud. I would like the implications confirmed before authorizing any reset.