Bottomline Technologies' stock tumbled 34% Wednesday after the company issued a profit warning, citing an expected slowdown in sales as potential customers hold back on technology purchases during the months leading up to the year-2000 computer conversion.

The Portsmouth, N.H.-based company sells electronic payment software to banks and corporations and is considered one of many that would benefit from expected growth in the business-to-business electronic commerce market, predicted by Forrester Research Inc. to reach $1.3 trillion in 2002.

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