Taking place on 26-28 March next year, the Swiss resort beat off bids from London and Prague.
"The choice of venue for the 2006 event was hotly contested," said Davos Tourism director Armin Egger. "This is a great opportunity for us to showcase Davos and Switzerland as a whole."
C&I business accounts for 1.7 million overnight stays in Switzerland (5% of total), equivalent to EUR380m (£259m).
Meanwhile, MPI's 2005 World Education Congress will take place in Miami on 10-12 July.