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.

Key features

* 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

Live Mesh is Microsoft’s combination of client software, services, and developer tools.
Live Mesh will let users and developers automatically or manually synchronize data among devices and to the Web, share content, remotely access Internet-connected devices, create Web apps that are accessible offline, and client apps that connect to Web services.

Live Mesh Features

All your devices working together - No more e-mailing attachments to yourself. Instead, synchronize the information you need across all your devices. The most up-to-date versions will be at hand when you need them—at home, at the office, and on the go.
Access from anywhere - Anything you add to Live Mesh is available from anywhere, including the web from your Live Desktop. Your Live Desktop comes with 5 GB of free storage, and can be used from most web browsers.

Simple to share - Easily share files and photos with friends, family, and colleagues—invite them to a folder.
Stay informed - Keep track of all the activities in your mesh. See the online status of friends and colleagues, find out who has updated which files or folders, post and read comments, and check the status of your devices.

Protection - Mesh is password-protected with your Windows Live ID, so only you have access to it.

Access Live Mesh here
https://www.mesh.com/Welcome/Welcome.aspx