MILPITAS, Calif., Jan. 2, 2014 (GLOBE NEWSWIRE) -- FireEye (Nasdaq:FEYE), the leader in stopping today's advanced cyber attacks, today announced preliminary revenue and billings results for the fourth quarter and year ended 2013. Total fourth quarter revenue is expected to be in the range of $55 to $57 million, compared with previous guidance of $52 to $54 million. Total revenue for 2013 is expected to be between $159 and $161 million, compared with previous guidance of $156 to $158 million. Total fourth quarter billings are expected to be in the range of $95 to $100 million, compared with previous guidance of $82 to $86 million. Total billings for the year are expected to be between $254 and $259 million, compared with previous guidance of $240 to $245 million. The company expects to release final fourth quarter and full year 2013 results after the market close on February 11, 2014. Additionally, the company updated guidance ranges for 2014 billings and revenue to reflect the acquisition of Mandiant, which closed on December 30, 2013. Total revenue for 2014 is now expected to be within the range of $400 to $410 million, compared with the previous expected range of $240 to $250 million. Total billings for 2014 are now expected to be within the range of $540 to $560 million, compared with the previous expected range of $350 to $370 million. FireEye's prior guidance ranges were included with the announcement of the company's third quarter 2013 financial results on November 7, 2013. Mandiant Acquisition and Conference Call Announced In a separate news release issued today, the company announced the acquisition of Mandiant, a leader in endpoint security and incident response management solutions. The combination, which recognizes the ever-increasing intensity of cyber attacks and follows nearly two years of collaboration, creates the industry's leading advanced threat protection vendor with the ability to find and stop attackers at every stage of the attack life cycle. The transaction closed on December 30, 2013 and is expected to improve non-GAAP operating margins and operating cash flows as a percentage of revenues.