IE5/Mac = Officially Discontinued, no obligation to support or test
IE5.5/Win = Officially Discontinud
IE5.0/Win = Interestingly is not discontinued (because Windows 2000 is still supported by Microsoft) but nobody cares anyway.
IE6.0/Win = Still needs to be supported, but is very easy to test in since Microsoft not only supplies the Virtual PC software but also the disk image of an XP install dedicated to testing IE6, for free.
Also, there are standalone builds of all IE browsers on evolt.org which work just fine except when you need to use User-Agent sniffing (never) or Conditional Comments (sometimes but can be worked around easily enough).
As for Linux browsers the only ones we need to worry about are Links/Lynx, Konquerer and Firefox. If you have developed your site properly using good HTML and CSS you don't need to worry about Lynx. Konquerer uses WebKit which is the same rendering engine as Safari which conveniently we can now test in windows. Firefox is obviously not an issue.
Mac Browsers are all either based on WebKit or modified versions of Firefox so no problems there.
CoolMatty, IE5 and IE6 render very differently, IE6 and IE7 render the same as IE5 when in quirks mode. The main difference between IE5 and IE6 is the box model. But if you design your CSS intelligently this is very rarely an issue.
The reason why the text looks blurry in Safari on windows is because Apple's font rendering is designed to remain true to the font which unfortunately causes some blurring when aligned to the pixel grid. Microsoft's method is to smooth the font to the pixel grid for more readable screen display. Both approaches have merits and to be honest i'd prefer to have the choice which to use in the operating system settings and also on an application-by-application basis.
Detty. Professional Expert.
Flickr Twitter