Having gotten completely fed up with issues on our development server, including loads of 10 or higher on a regular basis (the day the load hit 57, we just stopped trying to get anything done), I gave up and took the advice of my colleagues and wiped Windows off of my box at work and installed Ubuntu. With work, this allows me to run our app locally. If there are any performance issues, they're mine and I can't blame the people administering the dev box.
I was astonished that Ubuntu is even easier to set up than last time. Setting up dual monitors wasn't easy due to the old Intel graphics card, but everything else magically worked right out of the box. Evolution works fine with Exchange and for the first time that I recall, its calendar works, too.
My only real complaint is that I'm having trouble finding a decent browser. Firefox is dead slow, hangs constantly, and sometimes crashes. Sure, I can, and will, search for performance tips for FF on Linux, but honestly, it's an embarrassment that this bog-standard technology is such a pig on Linux. There's still some noise about Google Chrome on Linux. That might help and I'd certainly look forward to it.
Time to check out Midori.