You can also add Active Directory to that list. Stupid simple to setup, join machines and setup policies. Small businesses with tens of pc's are easily managed from a single domain controller and the licensing isn't that bad when you're revenue easily covers costs.

Oh, and Office 365 is a blessing. I never thought I'd actually like SaaS anything from Microsoft but it works really well Office. It's also much easier than selling a $6000+ purchase req for 15-20 new office licenses. Especially when the boss doesn't see why office 2003 is obsolete in 2011 if it "still works fine for me". ~$240 a month was an easy sell with "free" exchange email and upgrades. Yea small shops are fun to work at.