Dropbox has launched a new version of its iOS app, providing push notifications of shared folders for the first time. Previously, when waiting for someone to share a folder with you, you had to repeatedly open and close the app to check for its availability. The feature is likely to be most appreciated by business users, as Dropbox file-sharing has become a very popular way to work around the size limits of email attachments when distributing large presentations. Dropbox 2.1 also adds better support for PDF viewing, displaying multiple pages on a screen, and file-sorting by date-modified, another feature of greatest value to business users who often deal with frequently-updated documents where it is vital to be working with the latest version. D
