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Office 365 - Moving Mailboxes From One Tenant To Another

FN-GM

By FN-GM
in Cloud Services

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FN-GM

FN-GM

Posted
Posted

Hi,

 

We are having another school joining our Academy Trust. At the moment they have a Office 365 tenant of their own. We want to move the mailboxes from this tenant into the academy trust tenant and close the first one.

 

We can't mass export PST files from Exchange Online using Powershell.

 

Does anyone have any thoughts on how we could do this please?

 

Thanks

smithson83

smithson83

Posted
Posted
This isn't going to be much help, or thrill you, but we ended up moving from one tenant to another. The only way I found of doing was to log in to Outlook (Full Desktop version) using each account in turn, backup the mailbox, login with new tenant, and restore it. I managed to get half our staff to do it them selves with crib sheets, but ended up migrating the other half with them sat next to me providing passwords, took about 5mins per user.
beany1

beany1

Posted
Posted
I'm probably totally wrong, but isn't this what the email migration thing is for in the admin centre under migration? If you specify other you can input imap details.
smithson83

smithson83

Posted
Posted

After a quick poke around, this (IMAP migration)does seem like an option, but its limited to email only (won't transfer contacts, calendar ot tasks etc.), 500,000 items (oldest to newest) and each email is limited to 35MB. Not sure if any of that is a problem. link

 

I'm sure there are 3rd parties that will happily take your money to do it for you...

snagrat

snagrat

Posted
Posted

I've used CloudMigrator365 (I think that's the name) to do this before.

 

We told TA that their accounts wouldn't move to save on money and just moved teachers and above.

 

Easy to use

  • 3 months later...
tj2419

tj2419

Posted
Posted
Hi,

 

We are having another school joining our Academy Trust. At the moment they have a Office 365 tenant of their own. We want to move the mailboxes from this tenant into the academy trust tenant and close the first one.

 

We can't mass export PST files from Exchange Online using Powershell.

 

Does anyone have any thoughts on how we could do this please?

 

Thanks

 

What did you do / use in the end?

FN-GM

FN-GM

Posted
  • Author
Posted

I haven't yet. There was an issue with the school joining the trust so it caused a delay. We have something more firm now so its coming on the cards soon!

 

Thanks

  • Thanks 1
  • 3 weeks later...
FN-GM

FN-GM

Posted
  • Author
Posted (edited)

Hello @tj2419

 

I have been playing around with this today. It looks like an IMAP migration is the way forward. Not the best solution but seems to work ok. But it doesn’t migrate contacts, calendar items, or tasks.

 

Thanks

Edited by FN-GM
  • 1 month later...
nathan

nathan

Posted
Posted

i've heard that users have had 10gb mailboxes successfully download.

 

I'm in the process of migrating emails from various services over to Office 365 so will test it out.

FN-GM

FN-GM

Posted
  • Author
Posted
I gave it a go today and downloaded a single 15GB mailbox without issue (apart from me rebooting the machine part way!!!).
Edu-IT

Edu-IT

Posted
Posted
I gave it a go today and downloaded a single 15GB mailbox without issue (apart from me rebooting the machine part way!!!).

It only does mail not calendars and contacts, right?

FN-GM

FN-GM

Posted
  • Author
Posted
It only does mail not calendars and contacts, right?

 

Exported everything.

 

I think your getting mixed up with a IMAP migration.

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