Point-missing on a vast scale
Can all the people posting comments along the lines of "There's no excuse for Edexcel not accepting Word .doc files, they're so common and everyone uses MS these days" try to hang on to the point that the course requirements specifically state that portfolios have to be submitted as a .pdf?
The school submitted portfolios that didn't meet the stated requirements of the course and didn't contain all the necessary files to display properly; as a result, they were all marked down. What else should Edexcel have done? The teacher, and the school more generally, are the ones at fault here. They failed in their duty towards their students and buggered up everyone's work. It has nothing to do with whether Edexcel's computers have Office installed or not.