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

Hi

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

Jason

Jason MIT Systems AdministratorAsked: 2017-10-31

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

Experts Exchange Solution brought to you by

Enjoy your complimentary solution view.

Get every solution instantly with Premium. Start your 7-day free trial.

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

LVL 9

RoninCommented: 2017-10-31

According to the documentation on sharing, if I understand it correctly the vendor would need to follow the same steps in his organization for "yournewdomain.com".
https://technet.microsoft.com/en-us/library/dd638083(v=exchg.141).aspx

Jason MIT Systems AdministratorAuthor Commented: 2017-11-01

Hi

Thanks

So there would need to be the TXT record in both organisations DNS to act as a broker for the connection, if I understand the process correctly?

Jason

LVL 9

RoninCommented: 2017-11-01

TXT record is used for validation, pretty much in the same manner as if you would do Federation with Office365. Simply follow the setup documentation.

Jason MIT Systems AdministratorAuthor Commented: 2017-11-02

I'm going to close this because I figured by using Outlook 2013 and pointing it to our mail server, I can get past Outlook 2016 trying to autodiscover external FQDN URL's - whereas we use internal.

So Outlook 2013 lets me add the shared mailbox fine

Thanks for your comments

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial