Re:Obviously (Score 1)

There are 3 types of message store backends - Those with a database - Those with a file system - Those with a mix A store with a database backend is NOT a condition to have single copy messages store. Look for example at Cyrus daemon, Mirapoint, Critical Path and Sun ... Still they 'of course' do support single copy message store. In addition Sun's message store supports single APPEND store which is of a KEY help when performing migrations from MS Exchange for example!