Best Migration Method for Exchange 2007 with multiple accepted domains

We are trying to determine which method would be best for us as we migrate to O365. Scenario as follows:
1) Multiple accepted domains (each in their own OU in AD); example: domainA.com, domainB.com
2) Exchange is 2007; clients will be upgrading the Outlook 2013
3) Would like to be able to sync mailboxes starting anytime but be able to cut over a domain at a time.
Tested so far with staged migration but it appears that with this, there is a change in the TargetAddress sending all mail to the O365. Even changing MXs didn't redirect the message as it reaches the Exchange box and immediately goes to O365.
We haven't tried the cutover as we're only able to test with the production box and if that somehow cutover the entire box, we'd be .. well, it wouldn't be good.
Anyone had any experience so that our #3 point would be doable, that would be great.
Thx
George

Hi George,
According to your description, I understand that the issue is related to Exchange migration from Exchange 2007 to Exchange Online for Office 365. This forum focuses on some general discussion about Office 365 ProPlus which
is the version of Office that comes with many Office 365 plans. Therefore, I suggest we can post the issue in Microsoft Exchange Online (Office 365) forum for more professional suggestions:
http://social.technet.microsoft.com/Forums/en-US/home?forum=onlineservicesexchange
Hope you can find the solution soon.
Regards,
Winnie Liang
TechNet Community Support

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