Organizations are cautious and highly protective of their messaging system, as they have to. Most of the research analysis shows continuing dominance of Messaging as the primary mode of business communications, making these systems mission-critical for most organizations. In short, when email fails, business suffers – sometimes dramatically.

Check out the following sites if you would like to see what their offers are in Exchange Hosting:

• ASP-One Hosted Exchange – Shared and Dedicated Solutions with Free SharePoint; Microsoft Gold Certified Partner.
  
• Hostway - Hostway, the global leader in Web hosting, brings proven Web presence management to over 400,000 customers worldwide.
  
• USA.NET - a Microsoft Gold Partner, SAS 70 Type II, and salesforce.com certified.
• Around the Clock Networks - Exchange Hosting, Hosted Sharepoint, and IT Consulting
• Aspace Exchange Service - Get microsoft exchange mailboxes as a service. Pay per user per month.
• Elephant Outlook - Smart and affordable way to outsource your company's email and collaboration using Microsoft Exchange.
• eOutlook - Hosted Exchange server 2000. 100MB, five aliases, domain names, with full access. Offers an automated service for handling single users to large business.
• eSERVER - Provides Exchange 2000 hosting and deployment.
• Exchange Hosting Service - Offers Hosted Exchange, using Microsoft Exchange 2003, Outlook Web Access, Outlook Mobile Access and full Exchange functionality through Outlook.
• Exchange Mail Hosting by Netplexity - Exchange Mail Hosting and Email Outsourcing using Microsoft Exchange 2003. Outlook 2000, XP, and 2003 supported.
• Exchange My Mail, Inc - Offers Hosted Exchange, using Microsoft Exchange 2003, Outlook Web Access, and full Exchange functionality through Outlook.
• FivePoints - On-demand messaging solutions via an outsourced model
• FrontPages Web Hosting Network - Dedicated Exchange Server Hosting
• HostLabs - Application Services Provider standardized on Microsoft Windows and managing Microsoft Exchange hosting with 100% fault-tolerant architecture and zero points of failure.
• HostLabs - Hosting company since 1999, hosting Exchange Server as a service. Official Microsoft Application Services Provider(SPLA).
• Intermedia.net - Offers Exchange hosting and related services
• JustExchange - Microsoft Exchange email hosting from a New Jersey company, includes all hardware, software, application management, administration, and hosting as part of the monthly service fee.
• 1Labs.net - Hosted exchange service provider for emailing, caledaring and scheduling needs
• MailStreet - MailStreet is Secure and Reliable Microsoft Exchange Hosting.
• Mi8 Corporation - Microsoft Exchange hosting and outsourcing.
• Server World - Exchange hosting services
• 123Together Exchange 2003 Hosting - Shared or Dedicated Hosted Microsoft Exchange Server 2003.
• Virtual Office Systems - Hosting service enables small to medium sized businesses to enjoy benefits of Microsoft Exchange and Microsoft Office without setup and maintenance.
• Virtual-eMail - Specialises in spam-free hosted Exchange email solutions for organisations of all sizes.
• WebSolutions Technology, Inc. - Provides Microsoft Exchange 2000 email hosting services including packaging and pricing.