I think a key difference, so far, between "enterprise" and "personal" handsets is the presence or absence of a "real" keyboard.

That is why, for example, the Palm Pixi is much more interesting as a business device than the Palm Pre, and also makes the Motorola Droid a potential competitor in the business space.

Tony cites his own decision to hold-off on purchasing a Windows Mobile handset as an example of how the for Windows Mobile 7 is killing the platform. He believes other customers will likewise delay purchases pending the next release.

I accept this premise for individual purchasers, but Windows Mobile, according to Microsoft, tends to be a fleet purchase. The boss gives everyone a handset and periodic replacements and upgrades are the norm.

These customers are more tied to a platform than a specific phone, as well as to the link between the handset and corporate assets, such as e-mail. Plus any custom or standardized business applications that are installed onto the handset.