After the installation completes successfully:
Only the 180-day trial is free. Production use requires a purchased license (Standard or Enterprise) through a volume licensing agreement.
When downloading the ISO, you must choose the correct edition. Both editions are contained within the same ISO binary—the edition is determined by the product key you enter during installation.
| Feature | Exchange Standard Edition | Exchange Enterprise Edition | | :--- | :--- | :--- | | Mounted databases per server | Up to 5 | Up to 100 | | Maximum database size | 1 TB (theoretical) | No limit (subject to hardware) | | Supported mailbox roles | Mailbox, Edge Transport | Mailbox, Edge Transport | | High availability (DAG) | Yes | Yes | | Intended for | Small to medium businesses | Large enterprises, multi-DAG environments |
💡 Pro tip: Even if you plan to use Enterprise, download the standard ISO—the same file works for both.