FlorianMueller writes: When the EU Commission launched its antitrust investigation against IBM last week, some were wondering whether there would still be mainframes around when the case is settled. But not so fast: eWEEK Europe just conducted a poll on mainframe spendings, and 30% of the respondents even plan to increase their mainframe capacities. At a recent presentation of the new mainframe generation, an IBM executive boldly said: "Western civilization runs on this system." So does IBM, owing 25% of its revenues and more than 40% of its total profits to the mainframe business. Mainframe software is a $24.5 billion market, twice as big as the Linux market. 200-300 billion lines of legacy code (much of it in COBOL) are still in use. So it's not just Microsoft and patent activists who take an interest in this.