federated trust for o365 and on prem exchange for sharepoint?

Hello.  We have 2 companies - company A is running o365 and the other ,company B, is running exchange 2010.  Company A created a sharepoint resource that they want to share with users of company B.  I've read that Exchange 2013 has federated sharing that I can bridge to to o365, but does ADFS between the on prem Exchange and o365 allow Sharepoint to "recognize" the AD users in Exchange?
akyuenAsked:
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MaheshConnect With a Mentor ArchitectCommented:
Federated sharing is different concept and Microsoft federation gateway is common platform which take care of that which enables free-busy information between two exchange organizations or between O365 and onpremise exchange, but it cannot be used for resource access
If this is merger or both companies are owned by same owner, what you can do, you can add domain having exchange 2010 (company B) to company A O365 tenant through Azure AD connect
In fact you need to add company B as additional domain at company A O365 setup (Assumed Azure AD Connect is already there in company A) and now grant access to domain B users on SharePoint as B company users are residing in same tenant as company A
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Hector AlvarezSenior EngineerCommented:
Company A Office 365 tenant must likely don't know Company B users, therefore, you need to allow the Sharepoint site in Office 365 access from "guests" and\or external users and then invite the Company B users.
You can't just federate company B with Office 365.
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Delphineous SilverwingGood Ol' GeekCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Mahesh (https:#a42470663)

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