One Office or Windows license on multiple PCs: what’s possible
You want to install Office on the living-room desktop, your work laptop, and your spouse’s computer. Simple question, rarely clear answer: can the same key activate multiple PCs? Here is what a perpetual license provides, what a Microsoft 365 subscription covers, how to check the activation status of each machine in practice, and what options exist when you need to equip three devices.
The basic rule of a perpetual license
A perpetual license is a one-time purchase: you pay once, the software remains usable, and it does not shut off after a year. This is the model used by Office 2016, 2019, 2021, and 2024 in boxed or download versions, and by Windows in the Retail version.
The historical principle behind this model can be summed up in one sentence: one license, one active device at a time. Consumer editions sold by Microsoft state this explicitly, for example, “1 PC or Mac” on the Office Family 2024 product pages. This is not an arbitrary technical limitation: the listed price corresponds to one device, not an entire fleet.
The important phrase is “at the same time.” For a Windows Retail license, transfer to another machine is allowed, provided the old one is deactivated or out of service. For an OEM license—the one preinstalled by the manufacturer—the key is tied to the motherboard and is not intended to follow the user to a new computer. For Office, the terms vary from one edition to another. Before counting on a transfer, read the terms for the exact product you own: that is the only authoritative document.
Above all, remember this: “perpetual license” does not mean “unlimited license”. It means “with no commercial expiration date.” The number of devices is a separate product characteristic, specified on the product page.
Why the confusion persists
Two things fuel the confusion. First, the product lines have deceptively similar names: “Office,” “Microsoft 365,” “Office 365,” “Family,” “Professional”… Two products with similar names can have radically different device rules; a family subscription covers several people, while a perpetual Family suite covers one device. Second, what the key technically does and what the license permits are two distinct questions: only the latter matters, and it is specified on the product page and in the software terms, not on the activation screen.
Microsoft 365 Family: multiple people, multiple devices, but one subscription
This is Microsoft's official answer to the consumer need for use across multiple devices. Microsoft 365 Family can be shared with five other people, for six users in total. Each person can install the applications on their devices and be signed in on five devices simultaneously. Each member has their own account and OneDrive storage, which prevents documents from getting mixed together.
For a family spread across several households, the flexibility is hard to beat. But there are two trade-offs.
It is a rental, not a purchase. You pay monthly or annually, and keep paying as long as you use the service. The cost is reasonable if you genuinely use the associated services: cloud storage, full-featured mobile apps, and continuous feature updates. It is less so if you open Word twice a month.
When the subscription ends, the applications switch to read-only mode. Microsoft states this plainly: you can view and print your documents, but you can no longer create or modify them with the installed applications. Your files remain yours, but the tool used to edit them stops working. That is the fundamental difference from a perpetual license, which continues to work without another payment.
If you would rather avoid renewing, perpetual suites are still available: the Microsoft Office range includes several generations, with genuine functional differences and different end-of-support dates.
Check the activation status of your machines
The first thing to know is that there is no universal screen showing “you have X activations remaining.” You can, however, check the exact status of each machine, and that is what matters before installing elsewhere.
For Windows
On Windows 11: Settings > System > Activation. On Windows 10, the path is different: Settings > Update & Security > Activation. There you can see whether Windows is activated and how: with a product key, a digital license, or a digital license linked to your Microsoft account. The latter is valuable information: it allows the troubleshooter to reactivate the system after a hardware change.
On the command line, an administrator command prompt and the slmgr /xpr command indicate whether activation is permanent or has an expiration date. The slmgr /dli command displays the edition and the last characters of the key in use, which is useful for finding out which key is actually installed on a computer.
For a perpetual Office suite
Open any application, then select File > Account. The “Product Information” section shows the exact version and activation status. If “Product Activated” does not appear, or a banner asks you to take action, that is where the problem will show up. This is the reliable method regardless of which edition is installed.
For a Microsoft 365 subscription
Go to your Microsoft account and open the Services & subscriptions section. You can see the current installations there and remotely sign out of a device, which is useful when an old laptop is still taking up a spot.
A sensible precaution before reinstalling elsewhere: properly deactivate or uninstall it on the old machine. This avoids most activation issues.
Windows 10, Windows 11: what’s free and what isn’t
Many people confuse “changing Windows versions” with “buying a license.” Let’s clear things up, because the mistake can be costly.
If your PC is running a genuine, activated copy of Windows 10, upgrading to Windows 11 is free. Microsoft states this on its end-of-support page: moving from Windows 10 Home or Pro to the equivalent edition of Windows 11 costs nothing, provided you are on version 22H2 and meet the minimum hardware requirements (TPM 2.0, compatible processor). No end date has been announced for this free upgrade. You therefore do not need to buy a license to leave Windows 10 on an eligible machine.
Standard support for Windows 10 ended on October 14, 2025. That does not mean an immediate cutoff: the consumer Extended Security Updates (ESU) program extends protection for eligible PCs until October 12, 2027, with several enrollment options. The deadline is therefore real but dated. Check your eligibility on Microsoft's official pages.
There are still situations where a licence can indeed be purchased: a machine assembled without an operating system, a device whose hardware does not pass the compatibility check and is replaced, or a need for the Professional edition where only the Home edition is installed. In these situations, the Windows 11 Professional page details what we advertise as delivering. To equip blank machines with both an operating system and office software, the Windows + Office bundles avoid having to manage two separate orders.
The options when you have three devices to equip
There is no single answer, but four possible routes, each with its own logic.
- Buy three single-device licences. Simple and contract-free, but you pay the retail unit price three times.
- Subscribe to a plan such as Microsoft 365 Family or Business. You cover several people and several devices, and pay as long as you use it.
- Use a volume licensing programme. These programmes exist, with varying thresholds: Open Value is intended for organisations acquiring at least five licences, with a contract and an intermediary reseller, while an Enterprise Agreement is aimed at large organisations and starts at several hundred devices.
- Go through a CSP partner. The Cloud Solution Provider programme is available without a minimum device threshold and is not limited to subscriptions: Microsoft’s Partner Center documentation explicitly provides for the purchase of perpetual software on a one-time basis. However, you must go through a partner, with a customer account and a business relationship to establish.
In other words, there are several legitimate ways to equip three devices, including with a one-time purchase. The real criterion for choosing is not “which one exists” but “which one matches your situation”: a company that already has a designated partner will make a different choice from an individual who wants three installations and an invoice.
What we advertise as selling on 123 Licence
Our catalogue is built around the 3-device format. Here is exactly what we advertise, without extrapolation.
- A licence advertised for 3 devices, for the version indicated on the product page.
- Delivery of the key by email, within a few minutes after the order, along with installation instructions.
- An invoice including VAT, issued by a French company, suitable for accounting purposes.
- A €29.99 price including VAT across a large part of the 3-PC catalog, or less than €10 per PC; the price that applies is the one displayed on the product listing.
- Support available if you encounter installation difficulties.
What we do not advertise, and what you need to know before buying: we make no promise of guaranteed activation, and we do not replace the publisher's support. If you need assistance from Microsoft, you must contact Microsoft.
For office software, the most requested option for equipping three machines is Office 2024 Professional Plus for 3 PCs, which corresponds to the latest generation. A word about earlier generations: Office 2021 reaches end of support in October 2026, according to Microsoft's published lifecycle. We continue to list it for compatibility needs with existing systems, but we do not recommend it for a new purchase today: beyond that date, there will be no more security updates. Check the exact date on the official lifecycle page before deciding.
Also take Apple into account: the products in the Office for Mac range are sold per device and do not follow the 3-PC format. The number of covered devices is indicated on each listing, and differs from that of the Windows products.
Compare cost structures
Prices change too quickly to be fixed in an article. This table therefore compares cost structures, not amounts: check the current prices on the official pages and product listings when making your decision.
| Option | Cost structure | And the following year? |
|---|---|---|
| 3 single-PC licenses purchased separately | Three times the retail unit price | Nothing to pay, but a full repurchase is required when changing versions |
| Microsoft 365 Family | Monthly or annual subscription, for up to 6 people | Must be renewed; when it ends, applications become read-only |
| Volume licensing program | Contract, minimum license threshold, intermediary reseller | Depending on the contract and any Software Assurance |
| CSP partner | Customer account with a partner; subscription or one-time purchase depending on the product | Depending on the plan selected |
| 123 Licence 3-PC offer | €29.99 including VAT for a large part of the 3-PC catalog | One-time purchase: no subscription to renew |
The reasoning is not purely mathematical. Ask yourself two questions. Do you need the cloud, online storage, and full mobile apps? If so, the subscription stands on its own. Do you simply want the desktop applications installed on three machines, with no renewal deadline? In that case, a perpetual suite meets the need, while checking two points on the page for the edition in question: the exact list of included applications, since not all editions include Outlook, and the end-of-support date for the chosen generation.
Frequently asked questions
Can I install Office on my desktop PC and laptop with a single-device license?
No, a single-device license is intended for one device. If you have two or more machines, choose a plan designed for multiple devices from the outset rather than hoping to stretch a single license: this is the most common cause of activation blocks.
What happens if I change computers?
It depends on the type of license. A Windows Retail license is intended to be transferred after deactivating the old machine; an OEM license is not. For Office, consult the terms of the product you own: transfer conditions vary from one edition to another.
Do I need to buy a license to upgrade from Windows 10 to Windows 11?
No, if your PC is eligible. Upgrading from an activated Windows 10 installation on version 22H2 to the equivalent edition of Windows 11 is free, provided the hardware meets the minimum requirements. Purchasing a license applies in other cases: a machine without an operating system, replacing an incompatible computer, or upgrading to a higher edition.
Are Windows and Office the same license?
No, they are two separate products, with two keys and two activations. A PC can have Windows fully activated and no Office, or vice versa. That is why bundles combining the two exist.
Can I install Visio or Project with my Office license?
No. Visio and Project are not part of any Office edition and are always licensed separately, including in subscription plans. They are listed in the Visio, Project and Access range.
How long will it take to receive my key?
We send an email within a few minutes of order confirmation, including the VAT invoice. If nothing arrives, check your spam folder before contacting support.