I need some here.

I have an Exchange 2010 and 2013 coexistence scenario. Majority of mailboxes are still Exchange 2010.

I now have licencing and want to move our entire environment into Office365. I want to start with one email domain, test it for a month then move another domain over. For example we have @volunteer.domain.com email domain users. I want to move them over to office365 first and basically use them as guniee pigs, before I move our staff/employee accounts over which are @domain.com. All of my @volunteer accounts are still on exchange 2010, and all proxy through the exchange 2013 cas servers. Basically only about 20 accounts have been migrated to exchange 2013.

I feel like I just need some help and direction on which way to go here.

  1. Do I first finish the on-premise migration so that everyone is an exchange 2013 mailbox, AND THEN setup hybrid with office365 and move the mailboxes to the cloud?
  2. Do I leave the @volunteer mailboxes in exchange 2010 and setup hybrid config, using 2010 or 2013?
  3. Do I move the 20 exchange 2013 mailbox users back to 2010 and get rid of the on premise 2013 exchange, then setup hybrid and begin moving people to office365?

I feel stuck not knowing which way to go forward.

  • Do you still need assistance with that? – Vick Vega Jan 16 '15 at 0:13

I'm going to gently suggest that you go read https://technet.microsoft.com/en-us/library/hh852414.aspx. To briefly answer: you can keep your Exchange 2010 and Exchange 2013 servers as they are, set up hybrid coexistence between your existing org and O365, and move mailboxes at your convenience.

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