Word, PowerPoint and Excel are the Holy Trinity of work productivity. This is the package that makes up Microsoft Office. The History of Microsoft Office infographic from Best STL (microsofttraining.net) highlights the history of past Microsoft Office releases and a preview of the 2013 version just released.
The design is great. Easy to read and not too much information. I've used every version of Office they have shown in the timeline.
At first, I thought this might have been an official Microsoft design, but it's really from Best STL, who is a Microsoft partner. It looks so much like a Microsoft design, they may be pushing the Fair Use of Microsoft's trademarks a little further than I would be comfortable with.