Reading an internal newsgroup i saw a colleague post a URL about Microsoft Dynamics CRM picking up CRM Customers from rivals. Nice and interesting story, you can read it as well over here:http://www.crm-daily.com/story.xhtml?story_id=002000001U3K
Yes, I think we are certainly trying. I am not confident in calling it 'Picking up' yet but we are certainly on our way. One of the Gold Certified Partners of Microsoft is almost finished the research on move from Sage ACT to CRM 3.0
(well, that's also because they get it for free as a microsoft partner). I am doing my best to help them.