Computer question: merging Outlook contacts with iPhone

I keep my iPhone docked with my computer at work, and the sync functions work pretty well for me. The exception is my contacts list. Our company is still using Office 2007, and I’d like to be a bit more selective about which of my contacts are shared between the phone and the PC.

Essentially, I’m fine with all of my personal contacts being backed up to the PC. But I’d rather not have my phone cluttered up with all of my work contacts. Can anyone tell me how to fix my settings so that I can specify which contacts on my PC are shared with my iPhone?

Much thanks in advance.