Download Dropbox 2.2.3 Release Candidate

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Dropbox works just like any other folder on your computer, but with a few differences. Any files or folders inside Dropbox will get synchronized to Dropbox's servers and any other computer linked to your account. The green checkmarks will appear on top of your files to let you know that they're synced and up to date. All data is transferred over SSL and encrypted with AES-256 before storage. Dropbox keeps track of every change made to any of its contents.

Download Dropbox 2.2.3
The links in this section correspond to file available for this download. Download the files appropriate for you.
Download Dropbox 2.2.3 Release Candidate
New in Dropbox 2.2:
Dropbox 2.2 contains following updates:

New notifications badge.
Refactoring of core sync engine.
Improved memory usage.
Startup performance improvements.
Finder icon overlay improvements.
What's new in Dropbox 2.2.3?
This build includes the following updates:

Fixed an issue on Mac OS X 10.4 which causes files to disappear after uploading.
Fixed a rare issue on Windows which causes Dropbox to endlessly sync files with long paths.
System Requirements
The Dropbox application runs on Windows, Mac OS X, and Linux operating systems. To run the Dropbox application on your computer requires:

At least 512MB of RAM
Free space on your computer equal to your Dropbox storage quota.
Windows 2003, Windows XP, Windows Vista, Windows 7 (32-bit and 64-bit) and Windows 8 (32-bit and 64-bit).
Mac: OS X Tiger (10.4) or later.
Ubuntu 7.10 or later and Fedora Core 9 or later.
Source:
Release Candidate Build - 2.2.3 program4secure.blogspot.com