I'm not sure really.
I started with Tiger HACK then got a MBP, it came with TIGER then having worked at Apple I got you know, all the free goodies such as Leopard, iWork, iLife which you can install forever, at least the Leopard is - got my copy from genius buddy.
Anyway, right now on the laptop, its tiger (still) with target EXTERNAL setup with 10.5.5 and 10.5.6 (was 10.5.2 for a while and needed 10.5.6 for iLife 09), a copy (back up) of tiger. Also on the laptop is latest BOOTCAMP with XP. So yes, it's possible to install TIGER and latest bootcamp. (will tell you in a second)...
Anyway, the reason I never upgraded was due to some higher end software not stable for LEOPARD and to be frank about it, Leopard was not installed in the APPLE back of house computers until just this past July, only the floor models had Leopard, since then, I just haven't gotten around to it - I suppose it's time, especially since I have back up copies. LOL.
To install latest BOOTCAMP with tiger, you have to basically install LEOPARD first, then bootcamp, then boot to target (in my case it was LEOPARD), and copy the back up of TIGER back onto laptop, when you do this, it never erases the BOOTCAMP partition.
Safe to say though that Leopard is stable enough - was really waiting for Pro Tools to become stable and it has been for a while now - just need to see what the story is with the latest Pro Tools 8 that just came out as many studios still use TIGER as knowone ever wants their MAIN HD systems down.
I recall a time when I was working with x.x.x, one composer for Everybody Loves Raymond, and talked him into upgrading - he did but made a mistake during the install - and his system was done for a few days! (ugg), not that it mattered that much..... as his day consisted of coming in at 12:30, leaving a few hours later, coming in only a few times a week, most time was on golf course, and one spotting session every two weeks and he collected a nice $5K check per week, not including his writers share of the royalties that will pay him the rest of his life. NICE NICE NICE...my goal too.... Get a show that goes into syndication = set for life...


God Willing I can make it too


Then I can afford $4000 for a tablet.