Only impact is ‘free’ right to upgrade to latest version which means the new licences are provided free of charge but it will still cost do upgrade from v5 to whichever the latest version is. If you stop maintenance and then decide in a few years time to upgrade MS will backtrack maintenance fee.
We are based in GB and we support (for a fee) all versions from 2 to 2016 whether or not you are in a renewal plan but then we are not a Dynamics Nav Solution Centre or Partner or whatever they are now called.
If the decision is to stay with NAV 5 with no intention to upgrade, the BREP license can don’t renew without affecting the current system processors and user logon.
What we need is the consultant support if I understand you correctly.[:)]
If you stop the renewals, you will be left with the license you have at the moment of “stopping”. It is eternal, you can go on using NAV forever, it will NOT expire, but you will not be able to get additional Objects (Forms,Tables,Reports etc) if you happen to need them for some customization.
In other words, you can not add anything to your license without paying MS the backtrack fee. If you already have bought some spare Objects, then there is nothing to worry about, if not, you can do it BEFORE the renewal plan expires.