Hi,

couchDB is a document-oriented database. It stores documents, IOW
key-value pairs, under a unique ID. These documents are retrieved
through views and queries. A mail with some tags and some mime parts is
a perfect exemple of what couchdb call a "document".

CouchDB databases can be replicated and synced in both directions.
Conflicts are lazily handled.

People here often call for facilities to read mail with notmuch from
different places. An unidirectional imap-to-couchDB, plus a couchDB
backend for notmuch, should give enough flexibility to achieve this
goal. Put a couchDB replica somewhere accessible, push new IMAP mails on
it, then sync as many machines as you want with this central couchDB
store.


-- 
  Paul