Microsoft stock punished as concerns multiply

icrosoft's market value fell by US$35bil after the software-maker worried investors with a series of troubling signals in its earnings report and conference call on Monday - AFP Photo.

SEATTLE: Investors wiped US$35bil off Microsoft Corp's market value on Tuesday without any clear-cut, single explanation.

The world's largest software company, whose shares had climbed about 30% over the past 12 months to near 15-year highs, worried investors with a series of troubling signals in its earnings report and conference call on Monday.