Microsoft is still referring to a year and a half-old vendor-funded report from the consulting arm of an analyst group that is no longer in business!
Check out this "TCO study": http://www.microsoft.com/exchange/evaluation/compare/METAEx2k3vNotes.mspx
So we still have our analysis posted at http://www-142.ibm.com/software/sw-lotus/lotus/offering1.nsf/wdocs/tcostudy until the FUD is put to rest!
Oh by the way did you know:
This report was done by not the analysts but by META consultants as part of a Microsoft paid engagement.. There is no mention of how they computed the TCO!
META was since been acquired.
Comparing apples to oranges is flawed: Exchange 2003 vs Notes/Domino R5, 6, and 6.5 customers (R5 shipped in 1999). Since the study we have shipped N/D 7. Meanwhile, we await Exchange "12"!
So folks: Be aware of facts. Bust this FUD.