Updated from 4:40 p.m. ESTSAN FRANCISCO -- Sun Microsystems ( JAVA) raised its profit margin estimates for the year, as it delivered its fourth consecutive quarter in the black after Monday's close. But a stubbornly sluggish top line continued to dog the company, pushing its shares down in extended trading. The Santa Clara, Calif., company mustered meager 1% year-over-year sales growth in its fiscal first quarter, with revenue of $3.22 billion. Analysts polled by Thomson Financial were looking for $3.27 billion in revenue, the equivalent of 2.4% year-over-year growth. Sun executives stressed that the company is committed to doing better, with CEO Jonathan Schwartz describing top-line growth as "absolutely our No. 1 priority" in the current fiscal year. He pointed to strong orders for Sun's Niagara servers, up 70% year over year, and industry-standard servers based on Intel ( INTC) and Advanced Micro Devices ( AMD) microprocessors, up 10%, as indicators of increasing demand. "We think we're going to be more exposed to that growth," Schwartz said in a post-earnings conference call. That exposure apparently won't be enough to bump Sun's full-year revenue expectations, which continues to call for low-to-midsingle-digit growth. While Sun did raise its full-year gross margin estimate by one percentage point to a range of 44% to 47%, the company acknowledged that some of that upside is simply the result of lower-than-expected component costs.