If it's free you're the product. Gee, where have I heard that before? Funny, how things boomerang back to hit you in the ass.
Have you checked, where your (offline) MS-Office connects, while you are working purely on offline files? Until now, it tried the following: www.microsoft.com, watson.microsoft.com, ots.optimize.webtrends.com, support.office.com, services.live.com, officeapps.live.com, live.com.akadns.net.
The solution to this problem is software that is free as in freedom, not snarky comments in support of MS.