Currently there are two versions of Zotero offered for download: Zotero 2.0 and Zotero 1.0.

• Syncing and backup of Zotero libraries
• Automatic detection of PDF metadata
• Rich-text notes
• Create and join public and private groups on any topic.
• Access in real time new research materials from your groups on the web or in the Zotero interface.
• Easily move materials from a group stream into your personal library.
• Automatic detection and support for proxy servers
• Trash can with restore item functionality
• Support for Endnote® export styles

• 1.0 Word Processor Plugins
• 2.0 Beta Word Processor Plugins

If you are already using Zotero 1.0, there are several additional considerations related to upgrading that you should review.