Personally I'm really excited about Composer. So many implications...<p>- What does this mean for Evernote?
- Can Dropbox pull off a new product without prior traction? Mailbox seems to have generally worked out OK, but what's happened to Carousel?
- Will messaging inside of Dropbox a valuable angle on collaboration and if so, will anything happen between Dropbox and Slack?
- What will this mean for Dropbox's relationship with Microsoft?
- Who will Dropbox acquire next? They have files, mail, notes...seems like a modern Exchange.