You need a word processor, a spreadsheet, and support for moving documents around. You have legacy documents in Microsoft Word format and Microsoft Excel format. If you are honest, you only use 10% of the features of either program (Don't feel bad. 95% of the user base is in the same boat.)
I was amazed at work when we replaced our Microsoft Document system with Media Wiki. We had all the services we needed, and people spend more time smearing in information rather than making it look good. As a bonus, we can "Send" documents by using URLs, or exporting them as pdf. It works for us.
I probably could move across to Xbox 360 to do the above.
Since my arm of the business does not do too much in the way of spreadsheets, I will forgo comment.