|Windows CE kernel||5.2||5.2||6.0|
|Required buttons||Start||Start||Start, Back, Search|
|Operating metaphor||Apps||Apps||Task hubs|
|Browser||IE Mobile 6||IE Mobile 6||New, still IE-based|
|Courting enterprise||Yes||Yes||Not yet|
|Social networking||Apps / Skins||Apps / Skins||Built-in|
This is a comparison of core OS functionality and differences, handset skins and carrier tweaks aren't factored in.
If you couldn't tell from the chart above, the "differences" between Windows Phone 7 Series and Windows Mobile of yore (last week) are rather hard to quantify: it's like comparing a bed with an oven. Two very different things, for two very different purposes. Windows Mobile has had a justifiable position in the realm of business, and will probably continue to maintain a legacy install base for some time to come, but it's pretty safe to say that the days of Windows Mobile as a consumer-facing OS are rapidly coming to an end. Bring on the new!