As a Microsoft Certified Gold Partner, SharePointSite provides collaboration and information sharing tools for small and medium business (SMBs). Shared and dedicated configurations available. Try an instant, free 30-day trial today--no credit card required... 

http://www.sharepointsite.com

MailStreet is a leader in Microsoft Exchange Server based email and collaboration hosting services. The MailStreet service enables organizations of all sizes to communicate more efficiently while reducing the costs and eliminating the headaches of maintaining dedicated in-house servers. Services include: Microsoft Outlook, Blackberry Enterprise, ActiveSync, GoodLink Wireless, and many more... 

http://www.mailstreet.com