COPENHAGEN — 
As a self-employed software engineer, Thomas Sorensen broadcasts his qualifications to potential employers across Europe and the Middle East. But to the ones in his native Denmark, he is simply unavailable.
Settled in Frankfurt, where he handles computer security for a major Swiss corporation, Sorensen, 34, has no plans to return to the days of paying sky-high Danish taxes. Still, an unknowing headhunter does occasionally pass his name to Danish companies.
"When I get an e-mail from them, I either respond negatively but politely," Sorensen said. "Or I don't respond at all."
Born and trained at Denmark's expense, but working - and paying lower taxes - elsewhere in Europe, Sorensen is the stuff of nightmares for Danish companies and politicians searching for solutions to an increasingly desperate labor shortage....
Young Danes, often schooled abroad and inevitably fluent in English, are primed to quit Denmark for greener pastures. One reason is the income tax rate, which can reach 63 percent....