Sharing calendar (free/busy) with external users Exchange 2010

Our sales team would like to share thier outlook calendar with an outside firm (free / busy information). This team hooks our sales members with potential clients and setup meetings on sales team members behalf. The issue I am having is that after reading thousands of articles on how to accomplish this, I am still not able to publish their calendars. I have the default sharing policy enabled and added mailboxes of users who want this feature. However when in Outlook I click on publish online, the only option I get is 'publish to WebDAV server'. Any hel p on this is greatly appreciated.

>Get-SharingPolicy
Name                                         Domains                                                                              Enabled                       Default
--------                                          -------------                                                                              -----------                        -----------
Default Sharing Policy    {*:CalendarSharingFreeBusySimple}                                      True                               True
Antonio02Asked:
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Adam BrownSr Solutions ArchitectCommented:
The easiest way to accomplish this is to configure the Exchange server for Federated Sharing. https://blogs.technet.microsoft.com/ucedsg/2010/04/22/how-does-federated-calendar-sharing-work-in-exchange-2010/ has a blog on how it all works. https://technet.microsoft.com/en-us/library/dd351109(v=exchg.141).aspx has more information.

Basically, you have to set up a federated relationship with the MS Federation Gateway. The other organization has to do the same. From there, you can create an organization relationship and share the calendar information that way.
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Antonio02Author Commented:
Thanks Adam, reading through all the atricles none have mentioned this solution. I will let management know and take it from there.

Thanks
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Adam BrownSr Solutions ArchitectCommented:
Federated sharing is the solution to this problem.
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