File-storage app maker and cloud vendor Dropbox has acquired the maker of email app Mailbox, marking its first move beyond its core file-sharing service.

Dropbox CEO Drew Houston told the Wall Street Journal that the Mailbox app will continue as a standalone service with Dropbox making use of the technology it has acquired to enhance features in the Dropbox app, such as email attachments.

Mailbox — released by Palo Alto-based Orchestra in February — allows users to save emails for particular times in the future and provides push notifications and easy deletion. It is currently available for iOS and Google’s Gmail although there are plans to expand to other services and platforms soon.

The terms of the acquisition were not disclosed but the Wall Street Journal reported that the 13 employees of Mailbox owner Orchestra will move to Dropbox as part of the deal.

Dropbox said in a statement that it was looking forward to making Mailbox “even better and getting it into as many people’s hands as possible”.