Alternatives to Microsoft Exchange

1) Zimbra (commercial and free versions available)

• Desktop client compatibility. Sync mail, contacts, and calendar to Microsoft Outlook and/or to Apple (Mail, Address Book, iCal).
• Professional administration. Real time mailbox backup and restore, high availability clustering, storage cost management.
• Zimbra Mobile. Over-the-air synchronization of mail, contacts, and calendar data with mobile devices.
• Advanced web productivity. Ability to search for content inside attachments and view attachments as HTML instead of downloading.
• Domain management. Ability to re-brand the web client and administer multiple customer domains.

2) Open Xchange (commercial and free versions available)

• Linux Compatibility. Support 30 different linux distributions.
• All Information in One folder. Using one folder, users can store all information needed for a particular project, including all contacts, meetings, and background information.
• Document Management. Automatic versioning, locking of documents during editing, saving from MS Office applications, and access from MS explorer.

3) Scalix (commercial and free versions available)

• Outlook Support. Offers automatic offline mailbox caching and improved PDA syncing.
• Plug-in support. Provides certified plug-ins support for Google Desktop and MSN Search, McAfee VirusScan, Symantec Norton Utilities and Captaris RightFax Outlook Extension.
• Search and Indexing Services. Real-time indexing of private and public folder messages. This results in sub-second mailbox-wide search and retrievals, even in very large mailboxes and folders.

4) Citadel

• Ajax Support. An intuitive, easy-to-use AJAX interface.
• Domain Management. Multiple domain support.
• Easy Installation. installs in minutes without the need to manually integrate all the different components together.

5) opengroupware

• Contact Management. Saves and organizes thousands of personal and company contacts, telephone, fax, addresses, e-mail contact addresses just to mention a few. Easily configurable with extensive and speedy search capabilities, categorization and remotely accessible.
• Group Calendar. Manage meetings and events for an entire group or individual set of accounts. Attach notes to appointments. Link appointments to contacts and projects. Automatic detection of conflicts.
• Resource Planner. Keep track of your company’s resources such as automobiles, projectors or conference rooms. Searchable timeslots to check for availability of specific resources or resources assigned to a specific group. Automatically check for resource conflicts upon appointment creation.

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