I been stuck in the windows world too long aswell, anyways from my understanding, If the drive is partitioned into two, one for linux, one for windows, you should be able to access them.
But keep in mind you can only run one OS at a time. So if your going to run a server, one OS will be completely useless.
My advice is if you want to move towards linux, install linux on a crappy computer, screw around with it for awhile, get use to the style, then when you think you've obtained enough knowledge, fully move over.
I personally wanna start using linux only but haven't had the time to learn much about it.
<font face=arial><h1>spfdz - NEVER FORGET</h1></font>