I have plenty of Windows machines for using software written for windows. Fortunately most of the s/w runs under W2k. I can see a definite issue with keeping web sites running well with IE as it mutates into ever new behaviors.
Oh yes! and it is ever so frustrating! I am reading FR right now because I needed a break from the frustration of trying to get my very clever CSS layout that works in flawlessly EVERYTHING else to behave in IE.
But such is the life of web dev.