Coexistence Between Office365 and Google Apps Gmail

My company utilizes Google Apps Gmail for email services. We will be acquiring an Organization that currently uses Office 365. Management has asked if there is a way to have the two mail infrastructures coexist. We are not going to migrate their mail but would like to share  calendar free/busy information and syncronize the address book across the two platforms.

Are there any native ways or cloud based services that will allow for such coexistence?
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tigran_pAsked:
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Allen FalconCEO & Pragmatic EvangelistCommented:
Dual delivery can let you keep both services.

Google has a cal sync tool that will sync free/busy info but is limited in scope.  

There is now way to sync GAL/GAB without a third party tool.
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tigran_pAuthor Commented:
Hi Allen,

Actually, this is more about two separate domains in two separate companies utilitizing two separate email platforms(Google for Apps for one and Office 365 for the other) to share free/busy between the two email platforms and synchronize the address book between the two domains.

We are not looking for dual delivery but more like two corporations with each having their own mail services being able to sync their respective GAL's and free/busy information across the platforms without having to migrate users to a single platforms.

The thought I had was to do a bulk import of contact items within Office 365 of all gmail apps accounts and vice versa within Google Apps for work.

This would be manual process and would be out need to be kept in sync but I guess it may work. However, I can not find anything that acts as an in-between to allow for free/busy publishing across the two platforms.
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Allen FalconCEO & Pragmatic EvangelistCommented:
Contacts would be a periodic manual process.

The calendar free/busy sync works, but is designed as an interim solution during migrations. I'm not sure I'd want to rely on it for the long term.
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Allen FalconCEO & Pragmatic EvangelistCommented:
The guidance had been provided bybthevthresd's contributiors.
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