On that date, users running these versions of OS X will be signed out and will be unable to sign in or sync using the desktop application on those computers. Existing files and folders inside the Dropbox folder will remain unchanged and will stop syncing through the desktop application.
Users will still be able to access their files through the Dropbox website, mobile devices, and other compatible computers.
The company recommends that users running Tiger or Leopard upgrade to OS X 10.6 Snow Leopard before May 18th.
You can download Dropbox from the link below. If you don't already have a Dropbox account you can get a free one from here.
https://itunes.apple.com/us/app/dropbox/id327630330?mt=8&at=11l655" target="_blank">Read More