Shares of

McAfee

(MFE)

were rising in extended trading Thursday after the security software maker beat Wall Street's first-quarter estimates and raised its guidance for the full year.

The company said that for the first quarter ended March 31, consolidated net revenue was $236 million. On a GAAP basis, McAfee earned $35.9 million, or 21 cents a share. Excluding items, McAfee earned $45.6 million, or 27 cents a share.

Analysts polled by Thomson First Call expected earnings of 19 cents a share and revenue of $216.8 million for the quarter.

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McAfee expects revenue for the second quarter to be between $220 million and $230 million and earnings, before items, of 24 cents a share, at the middle of the range. The Santa Clara, Calif., company forecast 2005 revenue of $955 million to $975 million and earnings of $1.15 to $1.20 a share.

In the extra session, McAfee's shares were adding 65 cents, or 2.9%, to $23 after losing 43 cents in regular trading.

On Wednesday,

Symantec

(SYMC) - Get Report

posted a quarterly profit of $120 million, or 16 cents a share. Revenue rose 28% to $713 million.