What is the conditions you can offer the tree inside?
In my experience of Norway, you guys keep the indoor climate very hot and very dry the whole winter. If this is the environment you can offer inside, it is better left outside digged down in the ground with some wind and frost protection. An unheated greenhouse is proboably the best if you have.
Norway is a long country north south wise. I reccon it might be hard to overwinter this trees in far north. Where are you located?
BR
Magnus