Buy Exchange Server CALs – Client Access Licenses for legally compliant email access

Anyone running Microsoft Exchange Server needs a Client Access License (CAL) for each user or device that accesses the Exchange Server, in addition to the server license. Without valid CALs, access to Exchange Server services is unlicensed—a risk that can lead to significant back payments during license audits. At Lizenzindustrie, you can obtain all current Exchange Server CALs as verified licenses—delivered immediately via email, at a price up to 70% below the official list price.

What is an Exchange Server CAL, and when is it required?

An Exchange Server Client Access License (CAL) is the access license that authorizes each user or device to access the services of an Exchange Server—sending and receiving emails, synchronizing calendars, retrieving contacts, and using all other Exchange features. It complements the server license and is mandatory under Microsoft’s licensing model for Exchange Server.

Specifically, this means: If 30 employees in your company send and receive emails via Exchange Server, you need 30 Exchange Server CALs in addition to the Exchange Server license. Without these CALs, these employees’ access to Exchange is not licensed—even if the server software functions technically and users can actually access their mailboxes.

Standard CAL or Enterprise CAL—what’s the difference?

Exchange Server CALs are available in two versions that differ significantly in their feature sets:

Exchange Server Standard CAL—The Standard CAL grants access to all basic Exchange Server features: email, calendar, contacts, tasks, Outlook Web App, ActiveSync for mobile devices, and access via IMAP/POP3. For most employees in standard work environments, the Standard CAL is perfectly sufficient and the more cost-effective choice.

Exchange Server Enterprise CAL – The Enterprise CAL is an extension license to the Standard CAL—it cannot be used on its own but requires a Standard CAL. Enterprise CALs extend the feature set to include in-place archiving for unlimited mailbox sizes without an external archiving solution, advanced compliance features such as in-place hold and enhanced eDiscovery capabilities, as well as unified messaging for voicemail integration into the email inbox. Enterprise CALs are primarily relevant for companies with strict compliance requirements, regulated industries, and users who need advanced archiving and compliance features.

Overview of all Exchange Server CAL versions

• Exchange Server 2019 CAL
• The latest CAL version—grants access to Exchange Server 2019 and all earlier versions. The top choice for organizations running Exchange Server 2019.
• Exchange Server 2016 CAL
• Grants access to Exchange Server 2016 and all earlier versions. A cost-effective option for existing Exchange 2016 infrastructures.
• Exchange Server 2013 CAL
• For existing Exchange 2013 infrastructures. Since Exchange Server 2013 is no longer supported, we recommend a newer CAL version for future-proof investments.
• Exchange Server 2010 CAL
• For the oldest legacy infrastructures. Suitable exclusively for isolated, specialized environments—newer CAL versions are also valid for Exchange Server 2010.

When do I need an Enterprise CAL?

The Exchange Server Enterprise CAL is worthwhile for users and companies that have at least one of the following requirements:

• In-Place Archiving: Users who want to access their entire email archive directly in Outlook and OWA—without an external archiving solution and without mailbox size limitations.
• Compliance and Retention: Companies in regulated industries that must retain emails in an unalterable state for defined periods—to meet legal, regulatory, or internal compliance requirements.
• eDiscovery: Organizations that need to search and export emails for legal proceedings, audits, or internal investigations.
• Unified Messaging: Users who want to receive and manage voicemail messages directly in their email inbox.

For all other users, the Standard CAL is perfectly sufficient and the more cost-effective choice.

CAL Compatibility – Which Version Do I Need?

Exchange Server CALs are backward-compatible: A newer CAL version also grants access to older Exchange Server versions. An Exchange Server 2019 CAL therefore also grants access to Exchange Server 2016, 2013, and 2010. However, older CAL versions may not be used for newer server versions.

To ensure your investment is future-proof, we therefore always recommend the latest available CAL version—the Exchange Server 2019 CAL.

How to Purchase from Lizenzindustrie

Purchasing Exchange Server CALs from Lizenzindustrie is incredibly easy. Select the CAL type and version, specify the quantity, add to cart, and complete the purchase—you’ll receive your license keys immediately via email. No waiting time, no physical shipping.

• ✔ Instant delivery of license keys via email
• ✔ Verified licenses – 100% activatable via Microsoft servers
• ✔ Up to 70% cheaper than the official Microsoft list price
• ✔ Standard & Enterprise CAL – both variants available
• ✔ All versions – CALs available for Exchange Server 2010 through 2019
• ✔ Legally compliant – verified licenses from EU retailers
• ✔ Fast support – we’ll help you immediately with any licensing questions

Do you have questions about the right CAL type or licensing strategy? Contact us—we’ll advise you free of charge and help you find the most cost-effective solution.

Frequently Asked Questions About Exchange Server CALs

Do I need an Exchange Server CAL for every user?

Yes. Under Microsoft’s licensing model for Exchange Server, every user or device that accesses Exchange services requires a corresponding CAL—in addition to the server license. This applies regardless of whether access is via Outlook, OWA, ActiveSync, or other protocols.

What is the difference between a Standard CAL and an Enterprise CAL?

The Standard CAL grants access to all basic Exchange features—email, calendar, contacts, and OWA. The Enterprise CAL is an extension of the Standard CAL and adds in-place archiving, advanced compliance features, and eDiscovery to the feature set. Enterprise CALs always require a Standard CAL.

Does the CAL version have to match the server version?

Not necessarily. Newer CAL versions also grant access to older server versions. An Exchange Server 2019 CAL allows access to Exchange Server 2019, 2016, 2013, and 2010. However, older CALs may not be used for newer server versions.

Can I also use Exchange Server CALs for external users?

No. Exchange Server CALs cannot be used for external users outside the organization—such as customers or business partners. External users who access Exchange services must be covered by External Connector licenses.

How quickly will I receive my license keys?

Immediately after purchase—your activation keys will be automatically sent via email. Activation takes place directly through the official Microsoft activation servers.