Shares of Symantec ( SYMC) were among technology's losers Tuesday, sliding 10% after the software company lowered its third-quarter earnings estimate. The company now expects to post earnings of 10 cents to 11 cents a share for the December quarter, below its prior view of 14 cents to 15 cents. On an adjusted basis, the company projects earnings of 24 cents to 25 cents a share, compared with its original forecast of 29 cents to 30 cents. Symantec estimates revenue of $1.29 billion to $1.31 billion, down from its previous forecast of $1.315 billion to $1.345 billion. Analysts polled by Thomson First Call project adjusted earnings of 29 cents a share and revenue of $1.34 billion. Looking ahead, Symantec sees adjusted fourth-quarter earnings of 18 cents to 20 cents a share, with revenue of $1.25 billion to $1.28 billion. Analysts project earnings of 32 cents a share and revenue of $1.4 billion. Shares were trading down $1.98 to $18.50. Lamson & Sessions ( LMS) fell 5% after the maker of electrical components cut its 2006 earnings projection. The company now anticipates earnings of $2.42 to $2.43 a share, down from an earlier forecast of $2.50 to $2.53 a share. Analysts forecast earnings of $2.52 a share. The company estimates revenue of $560 million to $561 million. Lamson blamed its revised outlook on weakness in its PVP pipe business. Shares were trading at $23.22, down $1.27.