A ban on Microsoft selling certain versions of its flagship products Word and Office has begun.
The software firm was made to change elements of the software by US courts after a patent dispute with Canadian firm i4i.
Microsoft said that it had complied with the court’s ruling and would now offer “revised software” in the US.
The court ruling means that Microsoft must also pay i4i damages of $290m (£182m).
However, the firm said on 8 January that it had filed another appeal against the injunction.
Read more: news.bbc.co.uk
