According to the European PlayStation Blog, the PlayStation Network is not going to be fully functional on PS4, PS3 and the PS Vita during the upcoming maintenance. There’s going to be issues with the message system, so reading, sending and deleting messages will be impossible. The group message titles will not be able to be renamed and we can’t add new members either. When’s this maintenance happening? Tomorrow morning between 6 and 9 AM in CET timezone.