Exchange 2010 OWA access to Public Folder

Recently upgraded from Exchange 2003 to Exchange 2010.

We have a calendar in Public Folders that was accessed by employees in other counties besides our own.  I set up users on our previous mail server AD for these people and they were able to access this public folder item using OWA (  http://ServerIP/public/calendar_name/?cmd=contents&view-monthly  ).  It prompted for user name and password and took them directly to the calendar and only to this calendar.

With Exchange 2010, this shortcut no longer works.  If I (as an Exchange mailbox user) log on to OWA, I can get the shortcut to the public folder

http://IP of server/owa/?ae=Folder&t=IPF.Appointment&id=PSF.LgAAAAAaRHOQqmYRzZvIAKoAL8RaAwDVv65QEcIMRJbX9SgKPQcJAAAAoD%2f8AAAC&pspid=_1319548651374_776953385

When we use this shortcut and try to log on as one of the remote users, we get the message that a mailbox could not be found for the user.  I do not want a full Exchange account & mailbox for these users.  I only want them to be able to access this one calendar.  Since Exchange 2010 now splits the AD & Exchange users, I'm not sure how to handle this.

I did find that if I create a Mail User, they show up in the Mail Contacts listing.  It will then accept their login with OWA for the public folder calendar but I get an error msgs that my Outlook Web App address is out of date.

Any suggestions/ideas/instructions for an Exchange 2010 newbie would be greatly appreciated!
DCInfoSystAsked:
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DCInfoSystConnect With a Mentor Author Commented:
Although HendrikWiese's suggestions and the articles mentioned were helpful, none of them resolved my issue as I was working with a shared Public Folders calendar item and not one user's calendar to be published to the Internet.  I ended up creating a mailbox user for each person, gave them permissions to this Public Folder item, hid their user from our GAL and set their mailbox storage quota to 0 so thay cannot send or receive messages.  I was able to generate a new OWA link for an Internet shortcut that takes them directly to the calendar item.  This resolution means that I have more "full" users in Exchange than I would like but was the only way I could get this to work.

I will be accepting my own comment as a solution to close this question.
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Hendrik WieseInformation Security ManagerCommented:
Try creating one mailbox per external company instead of per external user. Then send each company the username and password associated with them.
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Hendrik WieseInformation Security ManagerCommented:
You can also hide their user from the GAL within exchange if need be.
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Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

 
Hendrik WieseInformation Security ManagerCommented:
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Hendrik WieseInformation Security ManagerCommented:
I would suggest first looking at the second article specified:

Managing Internet Calendar Sharing in Exchange Server 2010 Service Pack 1 (Part 1)
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DCInfoSystAuthor Commented:
I had asked them to share one user account per county but they wanted individual log-ons.  I have hidden them from the GAL.  Thanks for the links.  I'll read through and respond further later.
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DCInfoSystAuthor Commented:
accepted own solution - no points awarded
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