Exchange 2007 to Office 365 - Staged or cutover.

Jotan192
Jotan192 used Ask the Experts™
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I have Exchange 2007 and I'm going to migrate it to Office 365. In the end I want the users in the on premises AD to be the same on the Office 365 so that when I need to create a new user or reset someones password I only need to do it on the on premises AD and have at the same time SSO. There are about 20 users in the exchange server so I want to do it during the weekend in one batch only. What is the better option? Stage or cutover migration? Which is more complex?
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Jose Gabriel Ortega CastroTop Rated Freelancer on MS Technologies
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Commented:
The more complex is the stage...
for 20 users I'd do a cutover migration you do need to have the data of the sizes of the mailbox so you can calculate how many time it would take.
to do a staged you do need to deploy at least an exchange server 2010 sp3 so it's a 2 steps migration (2007 -> 2010 , deploy ad connect then deploy the hybrid env, and then start the staged).

Another option is to use the SMTP and pop entry point to migrate them, but at the end is the same as using a cutover...

So the best bet is Cutover (and thing the only option)

https://docs.microsoft.com/en-us/exchange/exchange-deployment-assistant

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Commented:
A staged migration from on premises Exchange to Exchange Online its not a 2 steps migration. This type of migration can only be made from Exchange 2003 or 2007. With a staged migration I can link my AD users with Office 365 and manage them on my on premises AD. Is it possible to have AD sync and SSO with cutover?
Most Valuable Expert 2015
Distinguished Expert 2018

Commented:
It is, but only after you've completed the cutover. Make sure you properly match users though, as cutover creates then based on the mail attribute value.
Commented:
I made a staged migration (which is a direct migration from Exchange 2007 to Office 365) and have SSO with O365 apps. It went smoothly to the end and it was not that complex comparing to cutover.

Thanks to everyone.

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