Outlook 2007/Exchange 2003- Share calendars Between Companies

My company had recently became partners with another company and they are on two different domains.  We want to keep the domains seperate, but the users from both domains would like to see each others Calendar Availability via MS Outlook 2007.  How do we make this happen?
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You will need to have 2 separate profiles setup since exchange server only allows for 1 active connection to the exchange server. I know its not the best option but its a limitation of exchange.

Glen KnightCommented:
For free/busy information you can use InterOrg, see here: http://www.msexchange.org/tutorials/Configuring-InterOrg-Replication-Tool.html

For Global Address Lists, use GalSync: http://www.netsec.de/en/products/galsync/

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Glen KnightCommented:
>>I know its not the best option but its a limitation of exchange.

Sorry, but that's completely wrong.  It's a limitation of Outlook that you cannot connect to more than one exchange server, you can with Outlook 2010, see my guide here:

You are correct, I misspoke i meant outlook not the exchange server itself.
Glen KnightCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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