I've got a ISO/disk image of Office 2011 (from working at uni) and want to install it at home too, to be able to work from home. Yet don't want my employer to get billed or so and come after me. Does anyone know how this all works, how Microsoft checks versions or product-IDs etc etc. When installing at work, I didn't have to fill out any product/serial key or similar, it only gave me a product-ID to safely store if needed in the future (for whatever reason?). Anyway, can I safely install my work-copy at home without getting into too much trouble?