Less than a month ago, Mailbox announced that it had filled over one million reservations, with over 450,000 people still on the reservation list at that time.Good news! Mailbox is now available without having to wait in line. After 10 weeks of around-the-clock hard work, our engineering team has scaled the Mailbox service to deliver over 100 million messages per day (and growing). We believe we can now confidently handle new users as they sign up, so we've pulled down the reservation system.
As announced last month, Mailbox has also been acquired by Dropbox, with the two teams keeping their apps separate but drawing on their complementary resources and expertise to improve both services.
Article Link: Mailbox Removes Reservation System After Server Boost