With Yahoo’s Zimbra Desktop Beta all users of Yahoo Mail, @ymail and @rocketmail users — can access their mail and calendars offline.
Yahoo! Zimbra Desktop is the next-generation email application that makes email easy again. Zimbra Desktop is free for anyone use and is currently a ‘Beta’ version.
All your accounts in one place
Zimbra Mail, Yahoo! Mail, Gmail, AOL, Outlook or any other work or personal email account using POP or IMAP is easy to set up in Yahoo! Zimbra Desktop.
* Email, contacts, and calendar all in one application
* Available for Windows, Apple, or Linux desktop computers
* Easily set up Zimbra, Yahoo! Mail Plus, AOL and Gmail email accounts with the Account Wizard
* Any POP or IMAP email account can be added to Zimbra Desktop
* No limit to the size of your email storage
* It works online and offline
Visit Yahoo Zimbra and Download the client software here