我可以使用IE8与IE7兼容性来测试网站吗？

As a developer, can I safely upgrade to IE8 and use its IE7 compatibility mode to test how sites look in IE7? For IE6, I have a virtual machine and it is quite inconvenient. I don't want to upgrade to IE8 and then have another virtual machine now for IE7.As a developer, can I safely upgrade to IE8 and