"This means not only continuing to scale the service, but also including support for more email providers and mobile devices."

Please, please let this mean that they plan on supporting EAS. Migrating to Google Apps for Business in not an option for me, and everyone and his brother is building fancy IMAP-only email clients, while I'm stuck with the default mail client on my iPhone. I love Mailbox's interface, but I barely get a chance to use it, as my primary email address that 99% of my email goes through is on Outlook.com-hosted email.