I'm running Exchange 2010 and we are using GPO and a script to add signatures to emails. The vast majority of users have no problem at all but I have a few that are missing all or part of their signature. For example someone maybe missing a title while another may be missing a phone number. There are a couple of others that are showing old data after AD has been updated. These are happening across various versions of outlook from 2007 to 2013. I can't find a pattern to help explain the problem.