Since the return of christmas hollidays we have most of the emails that we received that are going into the junk mail in Outlook. No regards it is Outlook 2010 or 2013. I have uninstalled the windows update that was installed december 22 and doesn't seems to correct all the problems. I also create a transport rule in Exchange with SCL of 0 for the insides emails.
I use a domain network with Exchange 2007R2. Some users have Office 2013 and some have 2010.
Can somebody guide me to fix this?