My boss sent an attached Visio .VSD document for me to view today.
“Oh heck, I might as well take a look at it,” I concluded after some deliberation (kidding, my boss rocks--HI MIKE!). I haven't installed Visio on this rather new machine and had to remember on which office network machine it was on. But that seemed like too much effort at the time, so I went to the Microsoft Office downloads page and downloaded the Visio Viewer. That's so sweet. I didn't want to have to install Visio on this machine and I rarely need it, so it was great to have a Viewer available from your friends and mine at Microsoft.