When I saw this thread I thought "Are you serious?" The software I hate the most on Windows is Slotus Bloats so why in the heck would I run such a thing on my Mac?
As for searching email in spotlight, I suppose if Notes was set up as your default ...
< hold on a second while I hyperventilate >
... email client on OS X...
< Someone get the paddles! CLEAR!!! >
Ok, I'm better now... (I think...)
I suppose if Notes was your default OS X email client then Spotlight would look there.
I use Mail.app routinely and while it is a known universe better than notes, I'm really not totally happy with even with Mail.app. When I want to do something a little more involved, I use Thunderbird. I won't go near Entourage or Outlook but it's just a matter of personal preference. If you are on a good rapport with your IT guy, I would think you could ask him to set up your company Notes "domino" server to allow mail.app to come in as a client and then you would know for sure that Spotlight search of Notes email would work. I can say that on my Mac, Spotlight doesn't see inside Thunderbird and I've never bothered investigating why. I just assume that if Thunderbird was the default mail app, Spotlight could see inside it. Perhaps this is something I could tweak in Spotlight settings if I wanted to.