Share outlook calendar between two NOT trusted domains?

Hi all
We are a Danish company. We also have a Swedish company. Both companies are using Exchange 2007 built on a Windows Server 2003 AD. But we do not have any trust between ours AD or Exchange. And we don't want a trust between those companies.
BUT, now the Danish and the Swedish director want to see/share calendar and contacts!
Is there anyway I can accomplish this? They want to use Outlook 2007 and from here see the other persons calendar and contacts.
Hope to hear from any of you.
thnyvangAsked:
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RudramCommented:
* Could you have a look at the below link; might give you some hint:

http://www.msexchange.org/tutorials/GAL-Sync-Identity-Integration-Feature-Pack-IIFP.html

* Also you can think about implementing MIIS to achieve it:

http://www.microsoft.com/downloads/details.aspx?FamilyId=15032653-D78E-4D9D-9E48-6CF0AE0C369C&displaylang=en

Hope this helps (^_^)
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thnyvangAuthor Commented:
I will look at it and return.
I have never seen a MIIS server from Microsoft.
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