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Are they paying customers/active users of a product? If they are, then you have a business relationship with them and you're allowed to email them information that relates to their product.
What are you going to be doing with the updated information? If they've unsubscribed I would say it should only relate to the continued use of a product.
I figured this was the case. We do have an existing business relationship. This group of people just recently merged with another company (but still are existing customers) and we are looking to send them (both contacts that are not unsubscribed and contacts that are) an email to update their contact information so we can keep in contact. Obviously we would continue to honor their unsubscribe to our marketing emails. I figured this would classify as a non-marketing/non-commercial email.