Exchange CAL: Standard or Enterprise compared

Exchange CAL Standard or Enterprise? Every user or device that accesses an Exchange Server needs a Standard CAL. It covers email, calendar, contacts, tasks and Outlook on the web. The
Enterprise CAL is not a replacement but an add-on: it is added to the Standard CAL and unlocks the archive mailbox, holds, multi-mailbox search and protection rules. You need it only for the people who use these features. Both CALs work with both server editions.

Quick decision

Your situation	What you need
Normal mailboxes with email, calendar and contacts	Standard CAL for everyone
Individual people need an archive mailbox or a hold	Standard CAL for everyone, Enterprise CAL additionally only for these people
Journal rules for specific users or distribution lists	Enterprise CAL additionally for the people concerned
Several people share fixed workstations	device CALs instead of user CALs
All users have Exchange Online Plan 1 or 2	no separate CALs needed

Features compared

Feature	Standard CAL	Standard + Enterprise CAL
Email, calendar, contacts, tasks	Yes	Yes
Outlook on the web	Yes	Yes
Apps for Outlook and Outlook on the web	Yes	Yes
Site mailboxes	Yes	Yes
Role-based access control (RBAC)	Yes	Yes
Journaling	per database	per user or distribution list
Journal decryption	No	Yes
Archive mailbox (In-Place Archive)	No	Yes
Multi-mailbox search	No	Yes
Hold (In-Place Hold)	No	Yes
Protection rules for transport and Outlook, search in rights-protected messages (IRM)	No	Yes

The table follows Microsoft’s licensing overview for Exchange Server. On retention policies the sources contradict each other: the licensing overview lists default and custom policies for both CALs, whereas the Product Terms count custom retention policies among the features of the Enterprise CAL. The Product Terms are authoritative. They also list Data Loss Prevention as a feature of the Enterprise CAL.

The most important rules

The Enterprise CAL is an add-on. If you use Enterprise features, you need a Standard CAL and an Enterprise CAL. An Enterprise CAL alone is not enough.

You mix as needed. Not all users have to have the same setup. The usual approach is Standard for everyone and Enterprise for the people with an archive or a hold.

CAL and server edition are independent. The server edition determines the number of mailbox databases (Standard 1 to 5, Enterprise 1 to 100). Both CALs work with both editions.

User or device. A user CAL covers one person on any devices, a device CAL covers one device with any number of people. If several people share one workstation and access Exchange from nowhere else, one device CAL for this device is enough. The detailed considerations are in the guide User CAL or device CAL.

What is counted is the users or devices accessing, not mailboxes. A CAL belongs to a user or a device. If you open several mailboxes, you need no further CAL for that.

The version must match. A CAL entitles access to the same or an earlier server version. For Exchange Server 2019 you need version 2019 CALs or later.

External users need no CAL. According to Microsoft, their access to the standard features is covered by the server license.

Outlook is not included. No Exchange CAL includes the Outlook application. The Standard CAL entitles access through Outlook on the web and through mobile devices with Exchange ActiveSync. Outlook itself comes with Office; see
Office 2024: editions compared.

Exchange CALs come in addition to the Windows Server CALs. Exchange runs on Windows Server. Anyone who accesses the server therefore also needs a Windows Server CAL; details are in the guide
Windows Server CAL explained.

Worked examples

Situation	Standard CALs	Enterprise CALs
30 employees, all with a normal mailbox	30 user	0
30 employees, 5 of them with an archive mailbox	30 user	5 user
30 employees, all mailboxes on hold	30 user	30 user
10 terminals in shift work, 30 people without their own access from outside	10 device	0
30 employees, all with Exchange Online Plan 1	0	0

Typical cases

Engineering office with 12 mailboxes. Nobody uses an archive mailbox or holds; archiving is done with a separate solution. 12 Standard user CALs are enough.

Law firm with 25 mailboxes, partners need holds. 25 Standard user CALs for everyone, plus four Enterprise user CALs for the partners whose mailboxes are on hold.

Production with shared stations. 8 stations on the shop floor, 40 employees without their own device. 8 Standard device CALs cover all of them. For the 10 people in the office, 10 user CALs are added.

Switching in stages. Some of the mailboxes are already in Exchange Online, the rest are on-premises. Users with Exchange Online Plan 1 or 2 no longer need a CAL to access the on-premises server. You buy CALs only for the others.

Which version: 2016, 2019 or SE?

Buy CALs that match the server version. You should know two points here:

Support for Exchange Server 2016 and 2019 ended on October 14, 2025. CALs for these versions only make sense to extend an existing environment for the transition period. The options are in the guide Exchange 2016 and 2019: end of support and options.
For Exchange Server SE, Microsoft requires active Software Assurance or qualifying subscriptions for server licenses and CALs. The details are explained in Exchange Server SE: what changes. We do not carry licenses for the Subscription Edition.

If you run many Microsoft servers side by side, you will also find the Exchange Standard CAL in Microsoft’s Core CAL Suite and the Enterprise CAL in the Enterprise CAL Suite.

At VivaKeys

Exchange Server 2019: Standard 1 User CAL, Standard 1 Device CAL, Enterprise 1 User CAL
Exchange Server 2016: Standard 1 User CAL, Standard 1 Device CAL

The Enterprise CAL always requires a Standard CAL for the same person. All offers are in the
Exchange Server and
CALs categories. If you are unsure which quantity fits,
write to us with the number of mailboxes, users and devices and the server version. What the same question looks like for the database is shown in
Licensing SQL Server: per core or server + CAL.

Frequently asked questions

What is the difference between the Exchange Server Standard CAL and the Enterprise CAL? The Standard CAL entitles you to email, calendar, contacts, tasks and Outlook on the web. The Enterprise CAL adds the archive mailbox, holds, multi-mailbox search, journaling per user and protection rules.

Does the Exchange Server Enterprise CAL require an Enterprise server? No. According to Microsoft, both CALs work with both server editions. Conversely, an Enterprise server does not require Enterprise CALs either.

Do I need an Exchange Server user CAL for every mailbox? No, for every user who accesses Exchange. If one person opens several mailboxes, their one CAL is enough. Alternatively, you license devices with device CALs.

When is the Exchange Server 2019 Standard device CAL worthwhile instead of the user CAL? When several people share a few fixed devices and do not additionally access from other devices, for example in shift work or at reception desks.

What does an Exchange Server CAL cost? The price depends on version, type and quantity. The current prices are on the product pages in the
Exchange Server category.

Is there an alternative to the Exchange Server CAL? According to Microsoft, licenses for Exchange Online Plan 1 or 2 count as equivalent to the Standard CAL, Plan 2 also to the Enterprise CAL. The archive mailbox can also be obtained separately through Exchange Online Archiving for Exchange Server.

Are Exchange 2016 CALs valid for Exchange 2019? No. A CAL covers the same or an earlier server version. Version 2019 CALs, in contrast, also cover Exchange 2016.

Sources

Checked on 2026-11-10 against the publisher’s information:

Exchange CAL: Standard or Enterprise?