I moved an indoor bunny outside in January once:roll:
At first she lived in the storage room at school, moved her out a couple of hours each day (while I was at school) and made sure to give her lots of hay and such. During the holiday she lived outside in her hutch, filled with hay. She actually did fine. Normally I wouldn't move a bunny in the middle of winter like that, but it was a special cause... I couldn't sleep having her in my room anymore and at school, the storage room was the chosen spot for student rabbits, so she couldn't really live inside with the other school buns (though she did for a while, while I got her used to outdoor temperature)