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Hi, and welcome to the avast forums.

Is the Server Edition compatible with Microsoft Cluster Server under Microsoft Windows 2003 Server Enterprise?

Can I install the aVast Server Edition in a Clustered environment server?

Yes. See also here: http://www.avast.com/eng/avast_4_server.html#2

Do I need to reboot the server after install of Server Edition?

Unfortunately, yes.

Also, how is the license scheme for Active/Passive clustering? Do I need to buy one license per server in cluster or one license per Active server in cluster?

As avast Server edition is priced per-machine, I’m afraid you’d have to buy a license for each cluster node. :-\

Cheers
Vlk