EXPERT RESPONSE
No, it's not a possibility without setting up trusts between the two Exchange Server sites. If you already have a secure link, like a virtual private network (VPN) tunnel created between the two sites, I don't see why creating trusts should be a problem to meet business requirements.
Once you create trusts, you can use Microsoft Identity Integration Server (MIIS) Feature Pack 1a's GALSync tool to synchronize global address lists (GALs). This allows recipients from one organization to be replicated as contacts in the other organization and vice versa.
The next step is to use the InterOrg Replication Tool to replicate Free/Busy information. This allows recipients from one organization to schedule meetings with recipients in the other organization, and to be able to view each other's free/busy information.
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