What is the state of Master-Master replication?

[Michael Sofka]

A while back there was some discussion of supporting Master-Master 
replication in Cyrus.  I'm busy updating from 2.4.17 to 3.0.2.  What is 
the state of Master-Master, as opposed to Master-Replica replications?

My current configuration is a Murder cluster with three front-end 
servers, two back-end servers, each with their own replication server. 
One pair of Master-Replica are empty of mailboxes at the moment, prior 
to upgrade.

Thank You,
Mike

-- 
Michael D. Sofka               sofkam at rpi.edu
ITI Sr. Systems Programmer,   Email, TeX, Epistemology
Rensselaer Polytechnic Institute, Troy, NY.  http://www.rpi.edu/~sofkam/