Hybrid O365 with On-premise 2007 and 2010?

Is it possible to have a hybrid O365 Exchange Online with on-premise 2007 and 2010 Exchange?
Is it better to migrate mailboxes to Exchange 2010 before going hybrid?

I know there's Exchange 2013, but I don't know if it would be a good idea to add Exchange 2013 into the mix when I've already got 2007 and 2010.
There is also no high availability in the current Exchange environment and I'm very tight on space that poses a problem.
The idea is get about 2 TB of mailboxes from Exchange 2007 to Exchange Online, either directly from 2007 (1 migration) or from 2007 to 2010 to Exchange Online (2 migrations?)
garryshapeAsked:
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IvanSystem EngineerCommented:
Hello,

if you have Exchange 2010 in your organization then you can do it. Best thing is to have latest SP on 2010. One reason I know why Exchange 2013 is good for hybrid is in situation when you want to have only archive mailboxes on O365. If you try to do it with Exchange 2010 it wont work, you will need to have/add 2013 in you environment.
Beside that, Exchange 2010 will do the trick.

Regards,
Ivan.
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garryshapeAuthor Commented:
Ok thanks
So you know if there's any real reason to migrate mailboxes from 2007 to 2010 before putting the mailboxes originally from 2007 into Exchange Online?
Or can we move the mailboxes from 2007 directly to Exchange Online?
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IvanSystem EngineerCommented:
I have done only 2010 or 2013 hybrid, so I don't have any practical knowledge or that 2007/10 mix.
As far as I know, this will work as long as you have required SP and RU on your servers.
There is a list of required SP/RU on: https://technet.microsoft.com/en-us/library/hh534377(v=exchg.150).aspx

It says that you need to have Exchange 2007 SP3 or Exchange 2007 SP3 RU10 for this to work.
Of course MS recommends that you have 2013, but in detail spec, it requires min. 2010.

Regards,

PS: Even if all you mailboxes are on 2007 this should work, since 2010 is required just to be able to create hybrid environment. In that case you don't need to have a mailbox role of 2010, only Hub/CAS.
https://technet.microsoft.com/en-us/library/hh918206(v=exchg.141).aspx
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garryshapeAuthor Commented:
Hmm it says here:

On-premises Exchange organization  
Hybrid deployments can be configured for on-premises Exchange 2007-based organizations or later. For Exchange 2007 and Exchange 2010 organizations, at least one Exchange 2013 Client Access and one Exchange 2013 Mailbox server must be installed in the on-premises organization to run the Hybrid Configuration wizard and support Exchange 2013-based hybrid deployment functionality. We recommend combining the Exchange 2013 Client Access and Mailbox server roles on a single server when configuring hybrid deployments with Exchange 2007 and Exchange 2010 environments. All on-premises Exchange 2013 servers must have installed Cumulative Update 1 (CU1) or greater for Exchange 2013 to support hybrid functionality with Office 365. For more information, see Updates for Exchange 2013.

I'm not sure what that means. We need 2013 on-premise to allow 2007 and 2010 on-premise to work with Exchange Online?
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IvanSystem EngineerCommented:
I thought so too, but if you check table bellow, on that link, it seams that it is not required.

On-premises environment: Exchange 2007 SP3 RU10
Exchange 2010-based hybrid with tenant version v15: Requires at least one on-premises Exchange 2010 SP3 server.
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