In an obvious attempt to lure them users of DropBox to turn to the Cloud storage service OneDriveThe Microsoft gives all Dropbox customers 100GB of free storage for a year.
To get the GB donations, visit this page to sign in to OneDrive, and then verify your Dropbox account.
The offer appears to be working globally.
Please note that OneDrive already offers 15GB free storage, 2GB in addition to Dropbox.