I've been trying to transfer a domain name (.io) purchased from them to _another_ Network Solutions customer for business reasons. I can't even pay them to make this happen. "It isn't possible" they tell me.
Might be easier to send it to another registrar, and then let the other customer transfer it from there. Might cost a bit more but it could be the easiest way.
Didn't think of that! Thanks.
Be careful, with some TLDs there is a minimum time limit between transfers.