I posted this question on the Univention site, but got no answer.

I've installed Open-Xchange under the latest Univention server, and it all seems to be working well. I'll be doing testing for a few months, and I'd like to know if I need to license Open-Xchange right away, or if I can wait until after my testing phase. What does the license change / will my install stop working after 30 days?