GAMES FOR MICROSOFT EXCEL:

The classic Klondike version of Solitaire written for Excel. Using Excel as a development platform is an effective way to distribute small games that nearly anyone with a business computer can play. It also has the added advantage of being fairly invisible and unblockable to most regular IT departments.

To download, Right-click save target as...

Klondike-Solitaire

For more games in Excel, the website:

excelgames.org is a pretty good source.

dzikosoft.com also has a good game library and forum.