Zimbra Desktop is an excellent alternative for Microsoft Outlook and Exchange. It is for managing messaging software. It is efficient and easy to use. Compatible with all messaging services with POP/IMAP support, it allows you to configure POP accounts of Google Mail, Hotmail and AOL according to your preferences. What sets it apart is that it can work offline to access to Yahoo mail. Zimbra Desktop is free and can manage all email accounts on your desktop.