We're talking to Dropbox about mailbox app - hopefully it will support us soon, as with everything it's a matter of engineering resources.
We're also talking to many companies about a better API for everyone - the draft spec is at http://jmap.io/ - it's based on the API that our app already uses.
We're also talking to many companies about a better API for everyone - the draft spec is at http://jmap.io/ - it's based on the API that our app already uses.