HP has waived all conditions to the completion of its tender offer for outstanding shares of Mercury Interactive, except for the requirement that stockholders commit a majority of the outstanding Mercury shares.
HP first announced the $4.6bn acquisition in July, saying at the time that it expected the transaction to close before the end of this year.
The company has since extended its tender offer three times, which is currently set to expire on 1 November.
Mercury become an acquisition target after the management software firm was caught in a stock option backdating scandal that forced its chief executive to step down earlier this year.
HP said last week that investors had tendered about 38.9 million Mercury shares, representing roughly 44 per cent of the company's outstanding stock.
The waiving of the conditions is a regular procedural step, HP said. The acquisition recently met the two other conditions when it was cleared by antitrust authorities and when Mercury published its delayed annual report for 2005.
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