Updated from July 1

Shares of Sybase ( SY) were lower Friday after the software maker warned that quarterly results will once again fall short of expectations due to weak sales in North America.

The stock was recently down $1.29, or 7.3%, to $16.38.

Sybase said revenue in the second quarter, which ended June 30, will range from $188 million to $192 million, with pro forma earnings ranging from 17 cents to 20 cents a share. That's less than the 24 cents a share on $198.6 million in revenue expected by analysts polled by Thomson First Call.

Earnings calculated under generally accepted accounting principles are expected to range from 12 cents to 15 cents a share.

"Our results were impacted primarily by lower-than-expected revenue in North America due to direct sales operations issues in the enterprise business, and we are taking steps to strengthen the process," Sybase CEO John Chen said in a statement. He said he was encouraged by business in Asia-Pacific and Latin America.

The preannouncement from Dublin, Calif.-based Sybase follows a similar warning about first-quarter results, although that time the company attributed the miss to several dot-com deals that failed to close.

The software maker did not address guidance for the full year in its preannouncement Thursday. Three months ago, Chen reiterated the company's guidance for fiscal-year 2004, with pro forma earnings expected to range from $1.08 to $1.10 a share and GAAP earnings expected to range from 92 cents to 94 cents a share. At that time, Chen also reaffirmed expectations that full-year cash flow provided by operations will be around $170 million.