OneDrive is a file hosting service that allows users to upload and sync files to a cloud storage and then access them from a Web browser or their local device.
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Pro Collaboration via Office 365
If you use Office 365 with OneDrive, you can share a file to edit collaboratively in real time.
Pro Automatic photo uploads from phone
When Android, iOS and Windows Phone users shoot a photo with their phone it is automatically uploaded to OneDrive via app.
Pro Microsoft Office integration
It integrates with Word, Excel, PowerPoint, etc as if you were using OneDrive locally.
Pro Music file syncs with Groove Music
Music files put in the Music folder in OneDrive sync with Groove Music.
Pro No setup for Windows 8/8.1
If you use Windows 8 or 8.1, OneDrive is already built in your system and can be accessed via file explorer.
Con Strictest code of conduct
Terms of Service forbid any kind of nudity, or that incites, advocates, or expresses pornography or racism among other things.
Con Becomes slower when it picks up a "Linux" user-agent
This may be intentional by Microsoft to force OneDrive users to use Windows. When OneDrive picks up a "Linux" user-agent it becomes slow whereas when from the same computer and browser it picks up a "Windows" user-agent it becomes considerably faster.