Intermedia.Net was an ISPCON mainstay. They have been seeling Hosted Exchange since 1995. This is an interview with the CEO about best practices for selling SAAS (software-as-a-service). It is not about the technology. It's a Business Decision.
Intermedia has expanded from email to Sharepoint and Office. Plus Intermedia is now selling Hosted PBX, Conference Bridge, and OCS including Blackberry service. Because Voice is just an Application that can be sold the same way as Hosted Email. What a triple-play: email, voice and apps.