Business software maker VMware Inc warned that its revenue would dramatically miss Wall Street forecasts due to the weak economy and a new product launch, sending its shares down 14 percent.

The 11-year-old maker of virtualization software posted on Wednesday its first-ever decline in quarterly software sales and said the impact of the recession would be exacerbated this quarter by pains associated with a major product upgrade.

VMware, majority owned by EMC Corp, estimated second-quarter revenue to be flat or down from $456 million in the year-ago period. That was below analysts' average forecast for revenue of $501 million, according to Reuters Estimates.

It's a serious miss. It is not just the magnitude that is troubling. It is the reason they are giving, said Global Equities Research analyst Trip Chowdhry. There is something fundamentally wrong -- either in product strategy or sales execution.

Company executives presented a grim picture of the economy, saying customers are not investing in new projects.

We cannot promise a near-term change from the current tough conditions we are in, Chief Executive Paul Maritz said on a conference call.

The year started very tough, he said. There were signs of improving sentiment toward the end of the quarter. It hasn't yet translated into people opening their wallets.

VMware's software lets companies boost the efficiency of severs by running dozens of virtual machines on a single piece of hardware.

VMware said the launch of the new vSphere 4 line of virtualization software -- its first major product upgrade in three years -- will upset an already unsettled sales cycle as distributors get accustomed to the new product and customers test new features before getting comfortable deploying them.

Chief Operating Officer Tod Nielsen said he was not sure when the sales cycle would return to normal. The honest answer is we just don't know, he said in an interview.

Goldman Sachs analyst Sarah Friar said it is not unusual for sales to soften when a company launches a major product upgrade, but the news is still unsettling to investors.

It sounds a little bit excuse-y, which I don't love, she said. But in fairness, when most companies have a new product cycle, there is a lull ahead of the storm. Everybody needs to test and understand a new version before they buy it.

Investors had expressed high hopes that vSphere would invigorate sales, sending VMware shares up 65 percent from March 5 to its formal launch on Tuesday.

Maritz said he did not expect its introduction to provide any near-term pump to sales. The product adds technologies to help centralize delivery of computing resources to VMware's existing virtualization software.

First-quarter software sales dropped 13 percent to $257 million. Investors were expecting software sales of about $270 million, according to Friar.

Total revenue, which includes maintenance and other services in addition to software sales, rose 7 percent to $470 million. Analysts were expecting revenue of $474 million.

The revenue shortfalls overshadowed earnings that were ahead of expectations. First-quarter profit excluding items of 25 cents, above the 20 cent average forecast, according to Reuters Estimates.

Net income rose 62 percent to $69.9 million, or 18 cents per share, from $43.1 million, or 11 cents a year earlier.

The company's shares fell 14.4 percent to $27.85 in extended trade. They had climbed 7.7 percent on the New York Stock Exchange before VMware released its results.

(Reporting by Jim Finkle; Editing by Richard Chang, Leslie Gevirtz)