Can developing apps for the windows phone 7 be done without windows 7? Some of the tools in the developer site gave a needs windows 7 error.
The emulator requires DirectX 10 with a WDDM driver, neither of which exist in XP.
From what I know you could bypass and install the dev toolkit but you can't really do any debugging or testing your app, so I don't know if it's worth it.
Apparently, in order to install it on XP you need to:
Download the Windows Phone Developer Tools CTP Refresh
Extract the contents of the setup package by running vm_web.exe /x and choosing a path to extract to
Go to the folder you extracted to in step 2 and open the file baseline.dat in notepad
Look for the section named [gencomp7788]
Change the value InstallOnLHS from 1 to 0
Change the value InstallOnWinXP from 1 to 0
Save and close baseline.dat
Run setup.exe /web from the folder you extracted to in step 2