これがSDKっぽいんだけど，WindowsXPの場合に必要なものが書いてある．
Download Windows Mobile 6 Professional and Standard Software Development Kits Refresh from Official Microsoft Download Center
- Microsoft Windows XP Service Pack 2.
- Microsoft Visual Studio 2005, Standard Edition or above (Express Editions are not supported). SP1 recommended.
- Microsoft .NET Compact Framework v2 SP2.
- ActiveSync 4.5. If not currently installed, it is available from Microsoft Windows Mobile web site.
つまり，貧乏人は排除なわけね．有料なのはWindowsXPとVisual Studio 2005かな？
