Connect 2 external exchange sites, to view calendars?

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Hi there

My company was recently taken over, and we want to set up some kind of
connection so that both companies can send mail directly to each other
and view each others calanders.
Site 1: has exchange 2003, Active directory 2003
Site 2: has exchange 5.5 and NT4 domain

I am wondering if we need to setup some kind of trust between the
domains? The main aim is to view calendars.

Is there is some kind of connector that will do the trick? I've been
looking into GWART but if there is anyone out there that has experiece
of setting up something similar, id be grateful if you can let me know
of your ideas.

Thanks

.

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