Startup Services

I’m using Process Explorer (as recomended by Tech Republic) to see what is running in my PC.
I noticed that when I open Outlook (2003), MS Word starts, which I assumed normal since I use Word as my Outlook editor. I am now using Office 2007 and I noticed that MS Word loads even if Outlook is not running. Why?
Also, WISPTIS.exe (Microsoft Tablet PC Component) is loaded. Why? I do not have a tablet in my PC.