Don't know if this will work for everyone but Outlook would freeze every time I opened it since updating to Windows 10 I'm using Norton and this worked solid for me. Click on Start Menu open "RUN" app, then type "Regedit" click enter this will open your registry dont mess around in here you can really screw your system up just do exactly as I type here and you will be okay. Click on "HKEY_LOCAL_MACHINE" scroll down to "SYSTEM" click on it then scroll down to "CURRENT CONTROL SET" click on it then scroll to "SERVICES" click on it then scroll down to "TIME BROKER" click on it. This will open a screen and towards the bottom you will see"START REG_DWORD 0x00000003" Double click the word "START" Then choose "Modify" a window will open and on the bottom left it will say "Change Value Data" change the 3 to a 4 then exit all the windows and reboot system, I have done this on 4 other machines with Macaffee and AVG and all of them have worked windows Outlook should then function properly...Good Luck