Yes, the 60 day trial period has expired.
I installed the Network License Manager (NLM) which is on the install CD too. Then I registered the NLM (as an ADN member). Then I had to configure an NLM service (based on the license file). When I reinstalled MapGuide Server I had to specify the serial number and the host name of NLM. Since then MapGuide Server (service) is working / running.
Thanks, Krisz. 🙂