Microsoft Exchange Server 2019 Enterprise

Microsoft Exchange Server 2019 Enterprise: Unlimited Database Scale for Mission-Critical Email

For large organisations, hosting providers, and multi-tenant environments, the database mounting limit is the single biggest factor determining your email infrastructure's scalability. Microsoft Exchange Server 2019 Enterprise removes this constraint entirely, supporting up to 100 mounted databases per server. This is a genuine, perpetual Microsoft retail licence, delivered instantly, which empowers your IT team to consolidate hardware, simplify high-availability architecture, and serve thousands of mailboxes without the artificial boundaries imposed by the Standard edition. Whether you are a service provider managing isolated tenant data or a global enterprise running dozens of departmental databases across Database Availability Groups, this edition provides the headroom your messaging platform needs to grow without costly server sprawl. It is the definitive on-premises email solution for organisations that treat email as a business-critical application, combining the full feature set of Exchange 2019 with the database density required for modern compliance, archiving, and hybrid deployment strategies.

Key features and benefits

• 100 mounted databases per server — Eliminates the 5-database limit found in the Standard edition, allowing massive consolidation for hosting providers and large enterprises managing multiple tenants or departments on a single server.
• Database Availability Groups (DAGs) for automatic failover — Provides native, application-level high availability by replicating databases across up to 16 Exchange servers, ensuring business continuity without third-party clustering tools.
• Rebuilt, Bing-powered search engine — Delivers significantly faster and more relevant search results across large mailboxes, improving user productivity when locating historical emails and attachments.
• Simplified Mailbox server role architecture — Reduces deployment complexity by consolidating the Mailbox and Client Access roles into a single server role, making planning, sizing, and maintenance more straightforward.
• Enhanced calendar with room booking — Includes improved meeting management features such as floor plans and room-finding capabilities, streamlining resource scheduling for modern workplaces.
• Hybrid deployment capabilities with Microsoft 365 — Enables a seamless connection between your on-premises Exchange organisation and Exchange Online, facilitating staged cloud migrations and unified recipient management.
• TLS 1.2 enforcement by default — Hardens your messaging infrastructure against modern threats by mandating strong encryption for all connections, protecting data in transit without additional configuration.
• Metacache database technology — Improves read performance for large, frequently accessed databases by caching key database structures on solid-state drives, delivering a responsive Outlook experience even under heavy load.
• Support for up to 256 GB of RAM and 48 CPU cores — Leverages modern server hardware to handle high-density mailbox deployments, ensuring consistent performance for thousands of concurrent users.
• In-Place Archiving and eDiscovery integration — Provides users with a seamless online archive for older email while empowering legal and compliance teams to search, hold, and export data across the entire organisation from a central interface.

What's included with your purchase

Your purchase includes a genuine Microsoft Exchange Server 2019 Enterprise retail licence key, delivered digitally. This is a perpetual, one-time purchase licence; the server licence itself does not expire. Alongside the licence key, you will receive a direct download link for the official Microsoft installation media and a comprehensive activation guide. A full VAT invoice is provided immediately, which is essential for your accounting and Microsoft asset management records. Because this is a retail licence, it is fully transferable and ideal for organisations that own their hardware outright rather than leasing it. Activation is performed against Microsoft's online servers or via a volume activation method if you are integrating this key into a larger Key Management Service (KMS) infrastructure. Please note that this licence covers the server software; Client Access Licences (CALs) are required for each user or device accessing the server and are sold separately.

Licensing explained: what you need to know

Exchange Server 2019 Enterprise uses a Server/Client Access Licence (CAL) model. You must purchase one server licence for each physical server running the Exchange software, and a CAL for each user or device that accesses the server. A User CAL permits a specific person to access Exchange from any device, while a Device CAL permits any user on a specific shared device to access the server. The Enterprise server licence unlocks the 100-database limit, but the compliance features like Data Loss Prevention (DLP) and In-Place Hold require an Enterprise CAL assigned to the user, in addition to the Standard CAL. Under the Microsoft Product Terms, you are granted rights to run the software in a virtual operating system environment on the licensed server, provided you manage the licence assignment correctly. For high-availability configurations, a passive failover server does not require a separate licence as long as it is truly passive and the number of licensed servers does not exceed the number of active instances.

System requirements / compatibility

Exchange Server 2019 Enterprise is designed exclusively for on-premises deployment on Windows Server 2019. It requires an x64 architecture-based processor from Intel or AMD. Microsoft recommends a minimum of 128 GB of RAM for the Mailbox server role, with 256 GB recommended for high-density deployments serving a large number of mailboxes. You will need at least 30 GB of free space on the system drive, plus sufficient storage for your mailbox databases and transaction logs; Microsoft recommends provisioning 100 GB or more per database to account for content indexing and growth. The server must be joined to an Active Directory domain, and the .NET Framework 4.8 must be installed prior to setup. An internet connection is required for product activation and for utilising hybrid features with Microsoft 365. The software is not supported on macOS or Linux. The user interface and management tools are available in multiple languages, including English, German, French, Spanish, Italian, Dutch, Polish, Portuguese, and Japanese.

Installation and activation

After completing your purchase, your unique licence key and a secure download link for the official Microsoft ISO will be delivered to your email address, typically in under a minute. Begin by downloading the installation media from the Microsoft Volume Licensing Service Center or the direct link we provide. Ensure your Windows Server 2019 environment is fully patched, joined to your Active Directory domain, and has the required prerequisites installed, including .NET Framework 4.8 and the appropriate Visual C++ Redistributables. Run the Exchange Setup wizard, select the Mailbox role, and when prompted, enter the 25-character product key we have supplied. The server will activate online with Microsoft's activation servers. If you encounter an activation failure, our free multilingual technical support team can assist you in resolving configuration conflicts. As this is a retail licence, you may reinstall the software on the same or replacement hardware, provided you decommission the previous installation.

Why choose Lizensa for your software licences

Securing a genuine Microsoft licence at a competitive price should not be a gamble. At Lizensa, we have built our reputation on delivering exactly that: 100% verified, authentic software sourced directly from authorised European distribution channels. When you buy your Exchange Server 2019 Enterprise licence from us, you are not just buying a key; you are investing in compliance and peace of mind. Your licence arrives by email in under a minute on average, allowing you to begin your deployment immediately. Every purchase is protected by the full weight of EU consumer law, including a 14-day right of withdrawal, and is backed by a full European warranty. Our Stripe-secured checkout supports SEPA, iDEAL, BLIK, GPay, and major credit cards, ensuring a smooth transaction wherever you are in the EU. You will receive a complete VAT invoice instantly, with reverse-charge mechanisms available for validated B2B customers. Should you have any questions during installation, our free support team provides expert guidance in multiple languages. Your activation is valid across all 27 EU member states, giving you the flexibility to deploy your infrastructure where your business needs it.

FAQ — frequently asked questions

Is this a subscription or a one-time purchase?

This is a perpetual, one-time purchase licence for Microsoft Exchange Server 2019 Enterprise. The server licence does not expire. However, you will need to purchase Client Access Licences (CALs) for each user or device, which are also available as perpetual licences.

What is the difference between Exchange Server Standard and Enterprise?

The core features and codebase are identical. The only difference is that the Standard edition is limited to 5 mounted databases per server, while the Enterprise edition supports up to 100 mounted databases. This makes Enterprise essential for large-scale, multi-tenant, or high-availability deployments.

How fast do I get my licence key?

Our delivery process is fully automated. On average, the email containing your unique product key, download link, and invoice arrives within 60 seconds of payment confirmation.

Is this a genuine and legal Microsoft licence?

Absolutely. Every licence we sell is a genuine, unused retail key sourced from Microsoft-authorised distributors within the European Economic Area. You will receive a full VAT invoice, which serves as your proof of licence ownership.

What if I have trouble activating the product?

Activation issues are rare but usually related to environment prerequisites. Our free multilingual technical support team is available to help you diagnose and resolve any activation errors you might encounter.

Can I reinstall or transfer this licence to another server?

Yes. As a retail licence, you can uninstall the software from one server and reinstall it on another physical machine, provided the licence is only active on one server at a time. This is a key advantage over OEM licences, which are tied to the first machine they are installed on.

Does this licence work in my country?

Yes. This is a pan-European licence that is valid for activation and use in all 27 EU member states. It is not region-locked to a specific national market.

Do I need Client Access Licences (CALs) to use this server?

Yes. The server licence permits you to run the software, but every user or device that accesses the Exchange server must be covered by a Standard or Enterprise CAL. Enterprise CALs are required to unlock advanced compliance features like Data Loss Prevention.

What payment methods do you accept?

We accept all major credit and debit cards, SEPA bank transfers, iDEAL, BLIK, and Google Pay. All transactions are processed securely through Stripe, a PCI DSS Level 1 certified payment processor.

Do you provide a VAT invoice?

Yes. A detailed VAT invoice is generated automatically and included with your licence delivery email. For B2B customers with a valid EU VAT ID, the reverse-charge mechanism can be applied to net the VAT to zero.

What is your refund policy?

Under EU consumer protection law, you have a 14-day right of withdrawal from the date of purchase. If you have not activated or downloaded the software, we will issue a full refund. Our support team will assist you with the process.

Can I use this for a hosted or multi-tenant environment?

Yes, this is the primary use case for the Enterprise edition. The 100-database limit allows hosting providers and large IT departments to isolate tenants or departments into their own dedicated databases on a single server farm, which is impossible with the Standard edition's 5-database limit.