We recently migrated from Office 2010 to Office 2013. An annoying change is Outlook's "Use Cached Exchange Mode" setting that changes the previous setting of all email to partial email based on how old emails are. This is confusing for end users because if they have a 1GB mailbox size limit and they look at the properties of their mailbox, it shows the cached amount which is always then less than the full amount. While they have a 1GB limit, the properties of their mailbox might say 700MB because that's all that is cached, but meanwhile they can't send because they are actually over 1GB on the server side.
I want to set this cache setting to "All" for EXISTING profiles and new profiles. I think I can do it with GPO for new profiles, but I don't see a way to set it for existing profiles. I assume I have to do this with a registry setting.