I'm not sure why there was a design decision to reserve so many UDP ports to take care of the DNS security fix (KB
953230). Thankfully, you can reserve ports that you know a service will need after the DNS Service starts up and you can also specify how many ports are reserved. I'm surprised a few of these well known ports aren't already reserved by default.
You can read how to work around this issue here at KB
956188. So far I have seen and heard it affecting ISA 200x, Exchange and a few other products that need well known UDP ports to operate correctly. I highly suspect but haven't confirmed that an OCS A/V Edge server will need reservations to avoid DNS stealing from its pool. Considering most edge installations are in a DMZ and/or a security hardened install, 99.99% of the installs out there will not be running the DNS Server service anyway.