Easiest way to resize is with 3rd party software. Partition Magic won't work on a server- you need a server enabled product. I've used Paragon Partion Manager Server Edition for several years- it's never failed me yet. Usually I'm going the other way- client's servers were set up originally with a small system drive, and need to expand it. But it will do it the other way too. Simple, straight forward user interface, allows you to resize, move, and anything else you want to do with a partition. As always, be sure to backup everything before you begin, in case something goes awry, although I've never had it happen yet. Server version costs $299, but I don't think that's unreasonable especially considering how well it works.