>>
>>It may be in Longhorn, but they're not doing any more development on it.
>
>Not in Win2K or XP.

The news article didn't mention any of the versions:

"[Outlook Express] just sits where it is," said Dan Leach, lead product manager for Microsoft's information worker product management group. "The technology doesn't go away, but no new work is being done. It is consumer email in an early iteration, and our investment in the consumer space is now focused around Hotmail and MSN. That's where we're putting the emphasis in terms of new investment and new development work."