A federal appellate court has taken up an appeal of a decision denying class certification to thousands of women employed in technical positions at Microsoft who claimed they were systematically passed over for promotions and raises.

The U.S. Court of Appeals for the Ninth Circuit took up an intermediate appeal of the ruling denying class certification in the gender discrimination case Thursday. The Ninth Circuit will review a June decision by U.S. District Judge James Robart of the Western District of Washington who found there were no uniform policies or job descriptions that tied together the thousands of women across multiple states who were part of the proposed class.