I just read this on Apple's MobileMe website:
- Compatible device: Mac, PC, iPhone, or iPod touch.
- For Mac: Mac OS X v10.4.11 or latest version of Mac OS X Leopard; Firefox 2 or 3 or Safari 3.
- For PC: Windows Vista or Windows XP Home or Professional (SP2) or later; Firefox 2 or 3, Safari 3, or Internet Explorer 7*; Microsoft Outlook 2003 or later recommended.
- For iPhone and iPod touch: 2.0 software.
- iPhone requires Wi-Fi or cellular network data connection for over the air updates; iPod touch requires Wi-Fi connection.
- iTunes 7.7 or later (free download from www.itunes.com/download).
- Internet access with compatible ISP (broadband required for web applications); fees may apply.
- Some features require Mac OS X v10.5 and iLife ’08.
* Internet Explorer 7 is not fully supported. Internet Explorer 7 has known compatibility issues with modern web standards that affect Web 2.0 applications such as MobileMe. You can use Internet Explorer 7, but you will not have access to all MobileMe features and will experience slower performance.
It appears IE7 isn't that great of a browser. Who would have guessed?