This can make a significant difference in the available hours for support. Ask to see the release notes for the most recent software release if possible. Ask for copies of the licensing agreement and support agreement and read these carefully. Ask for explanations of anything you don't understand. This is a great thing if you can get it, but it may possibly be reflected in the costs of support.
Training is very important.
Ask for full details of the vendor's standard training program. If you have special requirements, or wish to deviate from the standard, can other arrangements be made. Find out exactly what you will be charged for. Data conversion from your old system to a new one can be relatively easy or it can be a nightmare. Getting it correct can be responsible for dragging out the project longer than you hoped for.