Exchange 2010 to Exchange 2016

Get both systems co-existing, create a new DB on the Exchange 2016 server then use local move to move the mailboxes over to 2016.

Thanks Andy M, Where do I find local move and will this also move the user accounts?

Hi Andy M, I've looked at the Mailbox Migration tool, will I still have to create the users on the new Server first or does the move tool also move the accounts ?

Are these two servers in the same forest? If so, you don't do mailbox migration. As @andy wrote - you'll do local move requests.

Hi

You cannot move databases across, your only option is to do mailbox moves from 2010 to 2016.

To Move mailboxes between 2 exchange servers in the same forest you need to access ECP and set migration batches through a simple GUI. Or, in case you are able to use powershell, through scripting. The latter case allows you a mire fine grained control over migrations and migration errors. Also, you can define single moves instead of migration batches (useful to recover from single mailbox migration errors).
Have a look here https://practical365.com/exchange-server/moving-exchange-server-2013-mailboxes/

Lots of tutorials out there. Just try and cone back with any doubt you have.

Check following post to migrate mailboxes from Exchange 2010 to Exchange 2016: https://www.stellarinfo.com/blog/exchange-2010-to-exchange-2016-migration/

You can also move mailbox from exchange server 2010 to exchange server 2016 by using Exchange Admin Center, check this article.

Hi, it will be cross forrest, can someone tell me after moving, or before, should I create the accounts in AD or will the move do that?

For cross forest migration check this out: https://www.experts-exchange.com/questions/28961712/Exchange-2010-2016-cross-forest-migration.html