Dropbox on Wednesday unveiled a suite of fresh apps and Project Harmony, a new collaboration tool for Microsoft Office.

Project Harmony allows Dropbox for Business users to see when others are viewing the same Microsoft Office document in real time. Currently, the feature is only compatible with Microsoft Office, but the company said the feature will soon be coming to more applications.

Dropbox also unveiled the long-awaited Mailbox for Android app and demoed a new desktop version of the service. Both applications will use the same gesture-based controls and user interface as the iOS app. The Android app is now available for download in the Google Play Store. The desktop version, currently in beta, will roll out in the coming weeks.

Mailbox is also adding a new auto-swipe feature that learns from your previous actions to predict what you want to do with messages. If, for example, you delete the same daily deals emails each day, the app will automatically send those messages to your trash.

The app's settings will also sync to your Dropbox account so settings are preserved across all desktop and mobile versions of the app.

Dropbox also unveiled Carousel, a new iOS and Android app for organizing and sharing your photos and videos. The app, which Dropbox is billing as a place to store your memories, lets you swipe up to view photos from different time periods.

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