So, it is my understanding that 'upgrading' from sp1 to sp2 introduces a mechanism where the email feature is turned off (or set to external only) if you don't carry current maintenance? Is that correct? 3CX is fantastic, don't get me wrong... but I've never seen a traditional PBX take away a feature if you don't carry maintenance on it. Or ANY hardware or software for that matter. You simply are stuck on your version and lose support, not punished because you didn't throw money at a company regularly. If true, this is a disappointing move by 3CX. And honestly, I'm not even sure it's legal - you can't call it a perpetual license and then take away a feature based on people not paying for another offering. 3CX resellers should be up in arms if this is true.