Originally Posted by Linda & Lew
... a friend at work that suggested that I not be storing my bike with the chain on for long periods.
This probably goes back to the same rationale behind Fenlason's commentary on storing bikes in cold / high humidity locales where condensation can develop on bikes stored in unheated spaces due to rapid changes in temperature.
If you did in fact live in such a location and stored you bikes in an unheated garage, shed, or basement, removing the chains "could" mitigate the potential formation of rust or corrosion any where that moisture becomes suspended between the chains and sprockets.