I have several small and non-profit clients that are getting those dreaded security alert msgs when they open their outlook (2010 and 2013) connected to Exchange 2010. I have researched this several times and just am not comfortable with the powershell changes everyone recommends. I have tried the various manual adding of certificates and registry entries to supposedly disable - nothing works. These are small clients and do not want them to have to pay $500 for Microsoft to come in and do the work. Is there a surefire way to just disable the alerts via the registry or GPO OR add the certificate in Outlook 2010/2013??