Answer: Based on your description I suspect your tree was sunburned or shocked by the abrupt switch to outdoors. This tree will also hold its leaves for quite some time after it has died because they dry in place. The only way to tell if it is really dead is to break off a twig and see if it is green inside. Start at the tip and work your way up the tree. If the tree is still alive it may leaf out again. Set it in a very bright but cool location and allow it to recover gradually. Protect it from temperatures below 45 degrees to avoid shocking it any more than it already has been. Gradually move it outdoors, beginning with a little bit of early morning sun, so that it can slowly become accustomed to the full intensity of the sun and weather. I'm sorry about your tree!
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