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BPOS has Exchange, SharePoint, and Live Meeting. The cost is $10/month/seat. Users get 25GB of e-mail space.
Competitors include Novell GroupWise and Google Apps. I don't know whether $120 a year is a good deal for such a service. It seems a bit high. Both my company and main customer have workstation based Microsoft Office. Their license fees are probably $120 per person until we upgrade.