This is a set of online solutions stitched together to help businesses move their IT infrastructure over to Microsoft.

From the BPOS site, here’s the summary:

The Business Productivity Online Suite is a set of Microsoft hosted messaging and collaboration solutions including Microsoft Exchange Online, Microsoft SharePoint Online, Microsoft Office Live Meeting, and Microsoft Office Communications Online.

It is part of Microsoft’s Software + Services model.

Mary-Jo Foley over at Microsoft Watch notes that the service suite is expected to be released next month. However, Microsoft Online Services blog post she links to seems to have been pulled.