if you want all the open windows to close, you can choose window-->close all documents.
if you are talking about the projects listed in the solutions explorer, I dont think there is a shortcut key for minimizing all. Insted of clicking using the mouse for each project, you can open the solutions explorer, click on the 1st project and press the "left arrow", "down arrow" sequence until you reach the last project.
Regards
Ganesh
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