Windows Mobile as secure as Blackberry - are you joking?

At TechEd US 2008 this year I'm presenting a session which is called - 'Windows Mobile as secure as Blackberry - are you joking'

I wanted to cover this topic as there is so much FUD out there on the Windows Mobile Security story. 

Sorry - FUD - That's Fear Uncertainty and Doubt (off topic but I recently discovered that FUD means something very different in Scotland - please  Live Search this off your Corporate Network - I take no responsibility for any offence caused)

I'm starting to collate my content for this session but I thought I'd ask those of you who read my blog what issues/topics you thought I should include?