I must get my hands on this report (yes you need a subscription unfortunately). The small clipping does not indicate positive analysis about Microsoft either but is quite explicit on IBM …
Quantitative data from a recent Gartner survey shows that IBM’s seat share for e-mail and calendaring systems is significantly smaller than we thought, and that both Microsoft and IBM are losing customers to each other.
Source : Gartner.com
Update 24/1/07 : After scanning through the report I can only encourage you to go read it ! I can only say ‘The boss loves Microsoft’ 🙂