I work in an office with multiple locations. I was staging a new computer for an employee at the main office with a fiber connection. I set up their profile on Outlook 2013 so that it would use the bandwidth at the faster location and cache the emails here. When I deployed the machine, the location has a T1, the computer re-cached everything.
When I set up the profile, I made it cache all emails (not just 12 months), that was the only default setting change that I made.
I made sure that Outlook said "all folders are up to date" before I took it to the location. Why would it have re-cached the emails?