Microsoft has blocked users who have a Windows XP operating system on upgrading to Windows 7 Beta 1 which can be downloaded at their Technet site.

Currently, only users with Windows Vista SP1 can download the upgrade.

We’ve just been telling people like we always do, conduct a clean install. That’s the safest bet anyway. It shouldn’t be too much of a surprise,” said a Microsoft spokesman. If a Windows XP user tries to upgrade, he or she will see a warning which says that upgrading to Windows 7 is not supported.

The article at Channel Web notes that performance decreased from Windows XP to Windows Vista Ultimate to Windows 7 Ultimate on a test that was conducted.

Source: Channel Web