If your MixEmergency license key begins with "ME2", then you'll need to upgrade to a MixEmergency 3 authorization code in order to use MixEmergency 3.0 and higher.
If your MixEmergency license key begins with "ME1", then you're still eligible to upgrade, but you will need to get in contact via e-mail.
If you're having any problems, or have any unanswered questions, regarding upgrading, then don't hesitate to contact us.
There are a number of new additions, improvements, and fixes in MixEmergency 3 - and the list will grow as development continues on future versions. You can read the Release Notes for a full list of changes to MixEmergency.
When you upgrade to a MixEmergency 3 authorization code you will receive free updates until version 4.0. You will be able to take advantage of new features, improvements, and fixes for problems that may come up in the future (for example, relating to Mac OS X updates).
If you want peace of mind, great performance, and the most stable and problem-free system, you'll want to update.