I understand the point you are making, but I would like to take this opportunity to put in a good word for Codeweavers' Crossover Plugin/Office where development and testing are concerned. For a while now, Crossover Office has supported a Linux installation of Internet Explorer (not to mention Word, Excel, Powerpoint, Access, Adobe Photoshop, Lotus Notes, and Quicken) which allows me to preview my web pages on my Linux system. The pages still look better in Mozilla (due to IE's interpretation of certain standards), but mod_perl suffers no performance loss. ;)