Hewlett-Packard posted a surprise increase in quarterly revenue after sales from its personal computer division climbed 12 percent. HP sales rose a 1 percent to $27.6 billion in its fiscal third quarter from $27.2 billion a year earlier.

The company is undergoing a overhaul aimed at cutting costs and re-orienting itself toward higher-margin businesses such as computing infrastructure. It's trying to reduce a reliance on PCs and move toward servers, storage and networking for enterprises.

HP narrowed its earnings forecast for the full year to $3.70 to $3.74 per share, from $3.63 to $3.75. The company posted $1.7 billion or 89 cents per share of non-gaap diluted net earnings in the third quarter, up 3 percent and in line with forecasts.

The company is assessing its $4 billion software business in view of an industry migration toward Internet-based or cloud software.