Windows Phone 7 is lacking certain things at the moment.
Originally Posted by Wikipedia
Windows Phone 7 does not support:
The ability to connect to hidden wireless (Wi-Fi) hotspots,
Hotspots with a static IP address,
Tethering to a computer (although it can be done via hack on the Samsung Focus),
Videocalling,
VoIP calling,
USB mass-storage,
Universal email inbox,
Universal search,
Turn-by-turn navigation,
A system-wide file manager,
Bluetooth file transfers,
USSD messages,
Custom ringtones.
It has been confirmed that it will support some things that are missing eventually,
Originally Posted by Wikipedia
Among the features that have been confirmed to arrive in the near-future include
cut, copy, and paste,
full multitasking for 3rd party apps,
Adobe Flash.
Windows Phone 7 supports upgradeable storage via an SD Card, however it does not support the ability to hot-swap SD cards without having the phone reset to factory settings
https://secure.wikimedia.org/wikiped...7#Applications