When the Swiss franc hit a historic high of buying .70 euros in May 2010, people lined up at a Geneva exchange office to get rid of their euros. This week, one Swiss franc bought .90 euros. Fabrice Coffrini/AFP/Getty Images hide caption itoggle caption Fabrice Coffrini/AFP/Getty Images The Two-Way The Swiss Franc Soars, And The Swiss Worry August 3, 2011 The currency of Switzerland has soared to record highs against the U.S. dollar and the euro. Investors have rushed to buy Swiss francs, seeing them as a safe haven. And that has the Swiss government worried, as a stronger franc also makes exports more expensive.