Unable to use Mailbox Migration for Outlook.com Office 365 and IMAP
Problem reported by Ron Raley - 1/25/2023 at 11:00 AM
Microsoft has recently made it impossible to use the Mailbox Migration on SmarterMail.

There are various settings to reduce security, however, a popup login is required to authenticate, which SmarterMail does not produce. Looks like they require OAuth2.

Thunderbird, eM Client, etc produces this Microsoft popup login and authenticates successfully.

I believe that this has to do with "modern authentication" deadlines outlined here:


3 Replies

Reply to Thread
Linda Pagillo Replied
Hey Ron!

Try disabling Security Defaults for your MS account just until you are finshed with the migration. I had this same issue the other day using BitTitan's MigrationWiz to migrate from a SM account to a MS account.
Linda Pagillo Mail's Best Friend Email: linda.pagillo@mailsbestfriend.com Web: www.mailsbestfriend.com Authorized SmarterTools Reseller Authorized Message Sniffer Reseller
Chris Replied
According to this blog, they have disabled the ability to "enable basic authentication" https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-september/ba-p/3609437

And last we checked there is nowhere we can disable security defaults at MS365 to run the migration tool. It appears the migration tool only supports basic authentication. We have tried all 3 Exchange, Outlook.com, and Office 365 options. 

They have disabled basic authentication for:

Offline Address Book (OAB)
Exchange Web Services (EWS)
Exchange ActiveSync (EAS)
Remote PowerShell

We need OAuth2 support in the migration tool moving forward. We get quite a bit of people switching to us from Microsoft and are only able to do manual migrations through outlook at this time, which is a pain!
Employee Replied
Employee Post
Hi everyone,

Good news to share - this functionality is coming soon! Our upcoming major release of SmarterMail includes Microsoft OAuth2 support for OneDrive connections, mailbox migration and email retrieval. 

Feel free to give it a try now on the BETA build, and let me know your thoughts! 

Reply to Thread