GMail has instant search results and lets you filter and label, so you can quickly get to the important stuff in an overcrowded inbox. These days you expect to be online, so you can download just for a local offline 'cache' or backup. Do this and it will change the way you think of business email. Gmail is a strong Google offering. Gmail for your domain is a robust, web hosted, email alternative that still provides POP3 access for local copies.
Exchange's major features consist of mail,
calendaring, contacts and tasks, and support for the mobile and
web-based access to information, as well as supporting data storage.
Configure and access your mail accounts in a single portal. Create, edit, upload, store and share documents online. Plan, schedule and track your events, tasks and more. Free for individuals. 1GB free space
Business email software that can help people effectively share and manage information, make business decisions quickly, and streamline the way they work.
Outlook is a personal information manager often used mainly as an e-mail application, it also includes a Calendar, Task Manager, Contact Manager, note taking, a journal and web browsing. It can be used as a stand-alone application, or can work with Microsoft Exchange Server and Microsoft Office SharePoint Server for multiple users in an organization, such as shared mailboxes and calendars, Exchange public folders, SharePoint lists and meeting schedules.
Support your company’s success with an email solution that means business. Get all the features and security of a premium desktop solution—with the flexibility and low cost of a web application. WebEx Mail includes world-class antivirus and spam guard, live search, generous storage, right-click menus and more. It’s easy to set up, use, manage and grow. Integrate WebEx Mail instantly and seamlessly with Webex WebOffice.
Web email client that lets you keep track of task lists, chat with your Twitter and Gtalk
buddies, and see what your Facebook friends are up, all without leaving
your email. With ZenPages, you can easily share calendars, task lists, files, even
email, with whomever you choose, whether they use Zenbe or not. Zenbe's Files tab lets you browse your attachments independently, without having to find the email it came with.
Rackspace Email hosting gives you the power to securely manage email
from any web browser on the device of your choice - no licenses to keep
track of or software to download. Microsoft Outlook compatible
GroupWise is a messaging and collaborative software platform from Novell that supports email, calendaring, personal information management, instant messaging, and document management. The platform consists of the client software, which is available for Windows, Mac OS X, and Linux, and the server software, which is supported on Windows Server, Netware, and Linux.