If you have received invitation to join Yahoo Mail Beta, and want to explore it using "Internet Explorer 7 Beta 2". You may have noticed that Yahoo blocks every browser that isn't IE 5.5, IE 6.0, Firefox or Netscape.
If you want to use Yahoo Mail Beta in IE7, there's an easy fix: spoofing the user-agent.
All you have to do is, close Internet Explorer, copy & paste following text to a file and save as "ie6.reg"
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent]
"Platform"="Windows NT 5.1"
"double-click" on ie6.reg to modify the registry. Now you can use Yahoo Mail Beta and other sites that block any browser they didn't hear about, even if that browser name starts with "Internet Explorer".
Yahoo!, IE6, IE7, Mail Beta, Firfox