Intel has an SSD toolbox that allows you to run an "SSD Optimizer" that does not have any negative effect on the SSD, it just does the the wear-leveling, etc. that the TRIM command does (probably uses the TRIM command). So if you run this regularly, you could use an SSD with Windows XP (soon to be unsupported by MS) or Windows Vista, and the SSD would have a decent lifetime. I use this even with Windows 7, just to be sure that my SSD lasts as long as it can. I would use it more frequently with Windows XP, perhaps even if I deleted a very large file *smile*, which I sometimes do. I use VM's, and they generally have one humongous ".vmx" file that is several GB's.
You can even schedule the optimizer tool to run regularly, in case you don't remember to do it. So it can be done, but you have to take care to use the SSD Optimizer tool now and then.