This document highlights the strengths/value of Office 365 very well and provides reasonable amount of background evidence for each bullet.
Areas Enterprise customers see benefit when adopting Office 365:
- Enterprise leadership
- Privacy, security, and compliance
- Familiar user experience
- Flexibility to have a cloud and server option
- Get more from IT (Elimination of server upkeep, security mgmt, patch/update maintenance, etc.)
- Save time and money
WHITEPAPER: Office 365 Business Value & Usage Scenarios
http://download.microsoft.com/download/A/3/7/A3705185-C769-44AE-B6BB-88D0FC8A22D4/Customers-find-value-by%20choosing-Office-365-final.docx