MS 365 tenant migration?

Hey guys,

I’ve just taken on a new customer who is buying their company out of a larger firm. It all seems to be fairly amicable and friendly. Their domain is currently pointing MX to an Office 365 tenant that belongs to the current parent firm and we need to extract it.

Last time I had to do this MS told me I had to do without the domain for 90 (Ninety, count them) days whilst “the back end caught up” so we just migrated to Google… That was about 5 years ago though.

I assumed there would be a tenant to tenant migration process direct from MS but I dont see one.
I could; check what mailboxes exist (only 3-5), make local PST files, download everything, drop the domain from the current tenant, setup a new tenant, wait 48 hours, add the domain to the new tenant, upload from PST.

Does anyone have any better solutions? I’ve got two GoDaddy O365 to migrations on the cards as well so any help would be appreciated.

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Hi @garethw,

here we use this fantastic IMAP migration tool from dear old Mr. Lamiral: Mailbox Imapsync Online (

Regarding Sharepoint and OneDrive we use the migration tool from MS: SharePoint Migration Tool for SharePoint and OneDrive - Migrate to SharePoint and OneDrive | Microsoft Docs

Regarding the domain migrations, last time I did it it only took 3/4 hours before the new tenant let me add the domain. One good thing MS does is that it check for the DNS records you setup on your domain querying directly your domain’s DNS servers so after you add the TXT record MS=xxx it works instantaneously.

A good thing of IMAPSync is that you can run the sync multiple times, and I assure you you won’t get any duplicates. So you can run the sync in advance to sync all the email and than after the MX records go live you re-run the sync to get only the last couples of days.

Thanks @cabassi. I like the look of the IMAP migration tool but not sure I can trust the data to go through someone else’s server without knowing a bit more about it.

Will have a look at the MS SharePoint tool though for sure.

Regarding the IMAP tool you can easily install it on a server of your own, like we did.

It only costs 120 euro (support included). The guy who made it is very nice and helpful.
If I think at how much time we were wasting on mail migrations 120 euro are nothing…

And as a benefit: this works with IMAP so it can be used not only for Microsoft 365.

Cool. I’ll check again, I assumed it was a service.

Go to MailsDaddy website to get Tenant to Tenant manual process.

For the complete manual process, you can read the article posted on CloudBik’s official website. It contains a video tutorial also.

I can highly recommend BitTitan

We used it to migrate several hundred mailboxes from a hosted Zimbra email to M365. You can pre-stage the email into the new mailboxes and then sync the difference after you cutover. Depending on the license you can sync mailbox, Onedrive and automatically configure Outlook on the client.

It’s $12 to $15 per user depending on the license but well worth it. makes for a much smoother migration experience for IT and the end users

I recommend using Sharegate or Gs Richcopy 360 for migrating to/from MS Office 365 , both are GUI, easy and fast .
check the trial version first

I recommend Shoviv

Our organization recently merged two head offices and we used Microsoft 365 for emailing. One of our clients suggests the Shoviv Exchange Server Suite for tenant migration between Office 365.
Surprisingly its works!

There might be a smoother option for your O365 tenant migration with Microsoft. Check out their Cross-Tenant Mailbox Migration for a potentially faster route.