Exchange Server Build Numbers: What You Need to Know

In the world of IT, particularly when dealing with Microsoft Exchange Server, understanding build numbers can be crucial. Build numbers are used to identify the version of software or an operating system and can provide essential details about the functionality, updates, and patches applied. This guide delves into the significance of Exchange Server build numbers, explaining what they are, why they matter, and how to interpret them effectively.

Exchange Server is a mail server and calendaring server developed by Microsoft. It supports various features for handling emails, calendars, tasks, and contacts. The build number of Exchange Server is a unique identifier that tells you the exact version and the update state of the server.

Understanding Build Numbers

Every version of Exchange Server comes with a build number. This number increases with every update or service pack released. For instance, Exchange Server 2019 has different build numbers for its cumulative updates.

Build numbers are not just random digits but are structured in a way that they encode detailed information about the version. Knowing the build number allows IT administrators to ensure compatibility, apply the correct patches, and troubleshoot issues effectively.

How Build Numbers are Structured

Exchange Server build numbers typically follow a format like this: Major.Minor.Build. For example, the build number 15.02.0344.018 might indicate:

• Major version: 15
• Minor version: 02
• Build number: 0344
• Revision: 018

Each segment of the build number provides information about the specific version and the updates applied. The major and minor versions denote the core version and significant updates, while the build number and revision indicate incremental updates and fixes.

The Importance of Knowing Build Numbers

1. Compatibility Checks: Knowing the build number helps ensure that your Exchange Server is compatible with other software and hardware in your IT environment. It helps in verifying if you have the necessary updates and service packs installed.

2. Troubleshooting: When diagnosing issues, the build number can provide clues about known issues and fixes. For instance, if you encounter a problem that’s already been addressed in a later build, upgrading your server might resolve the issue.

3. Security: Build numbers can also indicate whether your server is up-to-date with the latest security patches. This is critical for protecting against vulnerabilities and ensuring that your system is secure.

How to Find Your Exchange Server Build Number

Finding the build number of your Exchange Server can be done through several methods:

• Exchange Admin Center (EAC): Log in to the EAC, navigate to the Server section, and select Servers. The build number is displayed under the Version column.

• Exchange Management Shell: Use the PowerShell command Get-ExchangeServer | Format-List Name,Edition,AdminDisplayVersion. This command will provide the build number along with other version details.

• Registry: You can also find the build number in the Windows Registry under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\ExchangeServer\V15\Setup. Look for the MsiProductVersion key.

Recent Build Numbers and What They Mean

To illustrate the evolution of Exchange Server, here’s a look at some of the recent build numbers:

• Exchange Server 2019 CU11: Build 15.02.1018.028
• Exchange Server 2016 CU23: Build 15.01.2471.007

Each cumulative update (CU) brings enhancements, fixes, and sometimes new features. It’s crucial to stay updated with these CUs to maintain optimal performance and security.

Best Practices for Managing Build Numbers

1. Keep Track of Updates: Maintain a record of all build numbers and updates applied to your Exchange Server. This helps in managing upgrades and troubleshooting issues.

2. Stay Informed: Regularly check Microsoft’s release notes and update announcements to stay informed about the latest build numbers and their changes.

3. Test Updates: Before applying updates to production servers, test them in a staging environment to ensure compatibility and stability.

Conclusion

Understanding Exchange Server build numbers is more than a technical detail; it's a key aspect of managing your server effectively. By knowing how to read and interpret build numbers, you can ensure compatibility, security, and efficient troubleshooting. Keeping your server updated with the latest builds helps maintain its performance and security, ensuring smooth operation in your IT environment.