The April distribution of a faulty software update cost Trend Micro $8.1m as of the end of June, the Tokyo-based security software company said on Thursday.

The issue has also forced Trend Micro to lower its second-quarter revenue and net income forecasts, the company said in a statement.

The faulty virus pattern file distributed by Trend Micro on 23 April disabled the computers of customers running Windows XP Service Pack 2. The company has said the faulty update was only available for 90 minutes but it still hit thousands of desktops and angered customers.

Trend Micro has lowered its revenue forecast by 2.9 percent and its net income forecast by 16.7 percent as a result of the incident, it said.

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