Microsoft Office non-commercial use. How will they know?
If it’s a one-person business you run in your house, no one will ever know. If you have employees, and fire one, and he knows, Microsoft might get a phone call – and you’d be sued. BTW, no, you wouldn’t have to retype it – you get the normal Office license first, then any documents produced by Office – in the future or in the past – are okay.