Migrate Exchange 2010 to 2013

Hi experts

We have a company that has exchange 2010 setup and they want to migrate to exchange 2013.
Problem is the users frequently travel oversea from one country to another and their mailbox is also too big.
Some users mailbox are about 50GB.
I know you'll be suggesting me to archive mailbox/move mailboxes from 2010 server after setting up exchange 2013.
But due to the case I mentioned above,(traveling,mailbox big) management wants something that migration won't affect them.
I know I can setup DAG to get mailbox DB copy but it should be the same exchange 2010. Anything like DAG can be done between 2010 and 2013 ?

Or any other way to synchronize DB from 2010 to 2013 ? At least once the DB is copied, I can switch over or something, like Office 365 cutover migration can be done for hosted Exchange from 2010 to 2013 without using external third party migration tool ?

Thanks
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bominthuAsked:
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Simon Butler (Sembee)ConsultantCommented:
Just move the mailboxes between the servers. It will have no effect on the users with the large mailboxes.
As you are on Exchange 2010, the move will not cause them downtime, other than right at the end, and you can make that change out of hours.

Simon.
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bominthuAuthor Commented:
Thanks for your respond.

I know there is no affect when we move between Exchange 2013 servers.

You mean there is no affect at all when we move from 2010 to 2013 ? User can still send/receive email during moving from 2010 to 2013 ?
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Simon Butler (Sembee)ConsultantCommented:
Throughout the entire move of the data the mailbox is still available to the user. It is only right at the end that they get kicked out, with a message saying the administrator has made a change. Restarting Outlook will usually get them reconnected straight away or with a small delay while Autodiscover reconfigures them to the new platform.

Simon.
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