6/4/2010 – updating a post that was originally published in June 2008. This update includes the option to access CRM using Mobile Express. - KW
While requests to use Microsoft Dynamics CRM and CRM Online from a Mac are not terribly frequent, it comes up every once in a while so it is definitely worth addressing.
Supported clients for Dynamics CRM include Internet Explorer 6 (SP2) and later, and Outlook 2003 (SP2) and later. Unfortunately, Entourage is not a supported client. And, supported operating systems are all of the Windows flavor.
So, while there's no direct method to do this, there's always a way, right? Here's a compilation of ideas.
Keep in mind that none of these methods are supported, but that's not to say they won't work.
HTH - Kevin