When Cyrus Daboo was first looking around for a name, there were honorable precedents in the internet mail world: elm, and later pine, set the arboreal tone for naming mail clients. And for an IMAP client that manages a "tree" of folders and messages, with its many "leaves" being RFC822 messages and MIME parts, another tree name seemed very appropriate. It just so happened that Cyrus was at the time living on a street in Cambridge called "Mulberry Close" and so history was made.