The company had been due to stop selling Word by court order on 10 October, but the injunction will mean that Microsoft and original equipment manufacturers will still be able to sell the software.
Dell and HP had filed briefs supporting the extension allowing Microsoft to sell the application, saying that a ban would severely disrupt their businesses.
"We are happy with the result and look forward to presenting our arguments on the main issues on 23 September," Microsoft spokesman Kevin Kutz said in a statement.
In August a Texas court ruled that Microsoft was in breach of a patent held by i4i over its use of XML in Word 2003 and 2007. The court fined Microsoft $290m (£177m) and told it to stop selling the software within 60 days.
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