Exchange 2010 migration to o365

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Occasional Contributor

Hi 

 

I am looking to migrate 5 mailboxes from exchange 2010 on premise server to 

office 365 in the cloud, and eventually remove/ shutdown my exchange server and work cloud only .

 

Some things to take in mind: one of my users has a 42 gb mailbox...

 

What is the best way to migrate ? should I use third party software - like bittitan?

And how can I deal with the large mailbox of 42 gb?

 

Thanks

 

Omer

7 Replies
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Hi! Please see the following documentation for what kind of migrations you can do with office 365! Using third party tool feels overkill for 5 mailboxes!
Also only doing 5 mailboxes seems like it’s better to export 5 pst files from the clients, provision users and licenses in 365, import the pst’s then change dns records to office 365
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For this kind of migration the best option is to use Cutover process described on the documentation.

 

The process is strait, and is the best solution to your migration.

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Yes! Was about to say! From these 3 the cut over is the one to go with
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Adam thanks for your response.
One of the users mailbox has a size of 42 giga...
Even if I export it to a pst file ...
Wont that be a problem because of the large file size?

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Hi @orrtech,

 

A PST can be corrupt, is advised that you use the Cutover because the transfer is from your Exchange On-Prem to Exchange Online and using the PST could have issues like corruption a deltas.

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yeah! I do agree with @Nuno Silva

I've done both successfully but the cut-over is a safer shot

 

adam