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Exchange 2010 - Federation Trust to see other organisation's GAL?

Last Modified: 2018-02-02

I've just created a two way forest trust between my company and a company we are in process of acquiring

At the moment the only requirement for mail is that we have a shared mailbox hosted in Exchange 2010 on prem at my company which we need to give the acquired company staff access to

We don't plan on migration as such, they will eventually move across to our site and use my company mailboxes - we will archive their existing mailboxes to PST

What is the best way to achieve visibility in Exchange just now? Federation trust, then set up an Organisational Relationship?

The acquired company's Exchange is hosted - would I need to get them to do the federation trust part on their side too?  I assume this is the case because what I've read refers to the Microsoft Federation Gateway, which again I assume both organisations need to be configured to use?

Thanks in advance

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