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| Feature | Standard Edition | Enterprise Edition |
| Mounted Mailbox Databases | Maximum 5 databases | Maximum 100 databases |
| Passive Database Copies | 257 databases | 257 databases |
| Database Size Limit | 16 TB | 16 TB |
| Default Database Size Limit | 1 TB but can be changed with registry key | 16 TB (16,000 GB) |
| Database Availability Groups (requires Windows Server 2008 Enterprise edition) | Included (limited by mounted databases) | Included |
| Unified Messaging | Included | Included |
| E-mail, shared calendaring, contacts, tasks | X | X |
| Advanced Active Sync Policies | X | |
| Journaling on per-user or per-distribution list basis | (per database only) | X |
| Unified Messaging (voice mail, for example) | X | |
| Custom Retention Policies | X | |
| Archive Mailbox | X | |
| Multi-Mailbox Search and Legal Hold | X | |
| Information Protection and Control (IPC): journal decryption, transport protectionr ules, Outlook protection rules, IRM Search | X | |
| Advanced anti-spam including Forefront Protection 2010 for Exchange Server | X |
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