Split Domain: Google Apps standard and Office 365 ?

I am new to Split domain email routing, so please help me with this.
We have 100 users on Google Apps standard and that is our limit for free accounts, now we need to add a dozen more accounts and I want them on Office 365.
How can I configure this so they can communicate internally and externally like they are on one server.

Thank you and some best practice guide would be great please.
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Allen FalconConnect With a Mentor CEO & Pragmatic EvangelistCommented:
My apologies.  I missed the grandfathered free version info.

You have a few options.

1)  Upgrade to the paid version (we and a few other partners have discount offers on this type of transfer)

2) Configure O365 as your primary email service and forward back to GAFW.  GAFW will go direct outbound (the config to avoid a relay can be tricky).

3) Put an email routing node in front of both services.

Of the three, #2 will be time consuming to setup and manage, but will not cost hard dollars; #1 will be the most reliable and easiest to manage/admin, but has a cost.
Johnny_NguyenAuthor Commented:
Hi Allen,
Split Delivery is not available on Google Apps Standard, it's available only to Google Apps Business
Any other suggestion please ?
Jian An LimConnect With a Mentor Solutions ArchitectCommented:
I am just playing devil advocate here. Allen has provided the best way forward but this is my thoughts.

I think it defeat the purpose to work together as a systems because you never achieve one systems with 2 seperate environment.
you might achieve on email domain side, but you have other issues like, calendaring sharing, address book and etc to work with.

This would only suggest in a short term and I usually never recommend to have a long term co-oexistence. you always need to either stay with gmail or go to O365.
Jian An LimSolutions ArchitectCommented:
Provide direction/answer to OP
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