I have an old Samsung Focus and my in laws are thinking about just using it. If I hook it up and go it'll work but it just wont get updates,right? I got rid of it before the 7.5 update so is it possible to still install that? Thanks in advance.
Unless it has some hardware deciding to fail now or whatnot, it will still work OK.
You can likely still update it to 7.5, and custom ROMs are even an option considering that WP7 was jailbroken.
Heck, you can go up to 7.8 if you so desire.
Yup, you can find Zune.
It actually was offered as an optional update on my PC.
It may take some reading, but ROM installation can be pretty straightforward usually.
Regarding custom-baked ROMs, XDA-Developers is the place to go for these kinds of things. (its the hub of WM, Android, WP, etc. heavy duty modding and stuff, etc.) Samsung Focus - XDA Forum
Here's a good place to start, especially in the Development subforum, there's a bunch of stuff down there.