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#61
Comodo Free Firewall seems to be the best choice for you. Aside from an included sandbox, it contains HIPS, which prevents apps from leaking/bypassing firewall by injecting to allowed processes.
Comodo Internet Security Setup/configuration thread (Setting Only) | MalwareTips.com
This page is a little outdated, because most people do not care, but the results are still valid.
Results and comments - www.matousec.com
You could also run a virtual machine without network and run OpenOffice from there. :)