Exchange 2013 - how to share calendar outside the domain

I have a customer running Exchange 2013 with Outlook 2010 clients.

Internal sharing of users calendars is working but how do I configure Exchange to allow sharing of a users calendar with a person OUTSIDE the domain?
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Vijaya Babu SekarConnect With a Mentor Associate Ops ManagerCommented:
you can configure through Fedaration, otherwise you create internet calendar sharing.

You may refer the below link to configure the Exchange fedaration

Internet calender sharing publish

Mike ThomasConsultantCommented:
You could federate with the other echange org if they can support that or you could use somthing like iCal.
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