Microsoft Licensing Guide: MAK, KMS, OEM & Retail Licenses Explained for 2026
Understanding Microsoft licensing is one of the most confusing challenges for IT professionals, small business owners, and individual buyers. The terminology — MAK, KMS, OEM, Retail, LTSC, FPP — can be overwhelming. This guide cuts through the complexity and explains every major Microsoft license type clearly, so you can make the right purchasing decision for your situation.
Quick Answer: License Types at a Glance
Retail — transferable, one PC, buy from any authorized reseller. OEM — pre-installed on a PC, hardware-bound, not transferable. MAK — volume key for IT pros activating 50–5000+ PCs from one key. KMS — enterprise server-based activation for 500+ PC environments. Perpetual — one-time purchase, own forever. Subscription — pay monthly/annually, access ends if payment stops.
Comparison Table: All Microsoft License Types
| License Type | Transferable? | Activations | Offline? | Best For |
|---|---|---|---|---|
| Retail (FPP) | ✅ Yes | 1 PC | Yes (phone) | Individuals, SMBs |
| OEM | ❌ No | 1 PC (hardware-bound) | Auto (BIOS) | New pre-built PCs |
| MAK Volume | ⚠️ Partial | 50–5000+ | Yes (phone/SLMGR) | IT pros, resellers, businesses |
| KMS | ✅ Auto | Unlimited | Yes (internal) | 500+ PC enterprises |
| Microsoft 365 | ✅ Yes | 5 devices/user | 30-day check | Teams needing cloud services |
| LTSC / Perpetual | ✅ Yes | 1 PC | Yes | Stable enterprise deployments |
Retail Licenses (Full Packaged Product)
A retail license is the standard consumer Microsoft license — purchased directly from Microsoft, an authorized retailer, or a digital reseller. Key characteristics:
- Activates on one PC at a time
- Fully transferable — deactivate on old PC, reactivate on new one
- Links to your Microsoft account for easy management
- Supported directly by Microsoft
How to identify: Run slmgr /dli in Admin Command Prompt — shows “RETAIL channel.”
Best for: Individuals, home users, freelancers, and small businesses activating 1–4 PCs.
OEM Licenses (Original Equipment Manufacturer)
OEM licenses are sold to PC manufacturers and come pre-installed on new hardware. The license is permanently tied to that specific machine.
- Hardware-bound — cannot be transferred to a new PC
- License dies with the hardware — motherboard failure = license lost
- Cheaper than retail per unit
- Modern OEM machines activate automatically via BIOS/UEFI SLIC
Best for: Fixed workstations that won’t be upgraded or transferred.
MAK Volume Licenses (Multiple Activation Key)
MAK is the standard tool for IT departments, resellers, and businesses deploying across multiple machines. One key — predefined activation count.
- Available with 50, 100, 250, 500, 1000, 2500, 5000 activations per key
- Each activation uses one count — permanently activates that machine
- No server infrastructure required
- Offline activation via telephone or SLMGR commands
- Machines stay activated permanently — no renewal needed
SLMGR Deployment Commands
slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (install key)
slmgr /ato (activate online)
slmgr /dlv (verify + remaining count)
slmgr /dti (get Installation ID for phone activation)Best for: IT professionals, MSPs, system builders, and businesses deploying 5–500 PCs.
Browse Windows and Office MAK volume keys at SoftLicenseDeals.
KMS Licensing (Key Management Service)
KMS is Microsoft’s enterprise activation method for large organizations. Machines activate against an internal KMS host server.
- Requires a KMS host server on your internal network
- Machines must reconnect every 180 days to renew
- Minimum thresholds: 25 Windows clients or 5 Office clients
- Unlimited activations — not count-limited like MAK
Best for: Enterprises with 500+ machines and Active Directory environments.
Perpetual vs Subscription
| Factor | Perpetual (e.g. Office 2024) | Subscription (e.g. Microsoft 365) |
|---|---|---|
| Payment | One-time | Monthly/annual recurring |
| Access ends? | Never | When subscription lapses |
| Feature updates | No (frozen at release) | Continuous |
| Cloud services | No | Yes (OneDrive, Exchange, Teams) |
| Works offline | Fully | 30-day check required |
| Multi-device | 1 PC | 5 devices per user |
| 5-year cost (1 user) | One purchase | $750+ (Business Standard) |
Windows Licensing: 10 vs 11
Windows 10 reached end of support on October 14, 2025 — no more security patches without paid ESU. Windows 11 is the current recommended OS for all new deployments.
| Feature | Windows 11 Home | Windows 11 Pro |
|---|---|---|
| BitLocker encryption | ❌ | ✅ |
| Remote Desktop host | ❌ | ✅ |
| Hyper-V | ❌ | ✅ |
| Group Policy | ❌ | ✅ |
| Domain join | ❌ | ✅ |
| Windows Sandbox | ❌ | ✅ |
Find Windows 11 Pro retail and MAK keys at SoftLicenseDeals.
Office Licensing: 2021 vs 2024 vs Microsoft 365
| Edition | Type | Support Until | Key Features |
|---|---|---|---|
| Office 2021 Pro Plus | Perpetual | 2026 mainstream / 2031 ext. | Full apps, no cloud |
| Office 2024 Pro Plus | Perpetual | 2029 mainstream / 2034 ext. | Updated apps, better perf. |
| Microsoft 365 Business | Subscription | Ongoing (while subscribed) | Apps + Exchange + OneDrive + Teams |
Find Office 2024 and Office 2021 license keys at SoftLicenseDeals.
Windows Server Licensing
| Feature | Standard | Datacenter |
|---|---|---|
| VM rights | 2 VMs per license | Unlimited VMs |
| Storage Spaces Direct | ❌ | ✅ |
| Shielded VMs | ❌ | ✅ |
| Best for | Physical / 1–3 VMs | Dense virtualization 4+ VMs |
Find Windows Server 2022 and 2025 license keys at SoftLicenseDeals.
Buyer’s Guide: Which License Do You Need?
- Individual / home user: Retail license — transferable, one PC, Microsoft account integration
- Small business (1–10 PCs): Retail keys or MAK 50-activation key
- Medium business (10–100 PCs): MAK volume keys (100–500 activations)
- Enterprise (500+ PCs): KMS + Microsoft 365 Enterprise
- IT Reseller / System Builder: MAK volume keys for client deployments
- Team needing email + cloud: Microsoft 365 Business Standard
Why This Matters
Choosing the wrong license type creates real problems: OEM licenses lost when hardware fails, retail keys rejected when deploying to 50 PCs, KMS infrastructure built for a 30-person company. Understanding these distinctions before purchasing saves money, time, and support headaches.
Frequently Asked Questions
What is the difference between MAK and KMS licensing?
MAK activates machines permanently against Microsoft’s servers with a fixed count — no server infrastructure needed. KMS requires an internal server, minimum 25 clients, and machines must renew every 180 days. MAK suits deployments under 500 PCs; KMS scales better for large enterprises with existing IT infrastructure.
Can I use a retail Windows key on multiple PCs?
No — a retail Windows license activates on one PC at a time. It can be transferred to a new PC after deactivating on the old one. For multi-PC deployment, use MAK volume license keys with 50, 100, or more activations per key.
What is an OEM Windows license?
An OEM license comes pre-installed on a new PC from a manufacturer. It is permanently tied to the original hardware and cannot be transferred to a new PC. If the PC’s motherboard fails or is replaced, the OEM license is lost with it — unlike retail licenses which survive hardware changes.
What is the cheapest legal way to license Windows for 50 PCs?
A Windows 11 Pro MAK volume license key with 50 activations is the most cost-effective option — lower per-unit cost than 50 individual retail keys, simpler to manage via SLMGR, and supports offline activation for air-gapped environments.
How do I check what type of Windows license I have?
Open Command Prompt as Administrator and run: slmgr /dli. The License Description field shows RETAIL channel, OEM channel, or VOLUME_MAK channel to identify your license type definitively.
Does Microsoft 365 include a Windows license?
No. Microsoft 365 Business plans include Office apps and cloud services only — not Windows OS. Windows must be licensed separately through retail, OEM, or volume licensing channels.
What is the difference between Office 2024 and Microsoft 365?
Office 2024 is a perpetual one-time purchase — pay once, own it forever, works fully offline, no subscription required. Microsoft 365 is a subscription that adds cloud services (Exchange email, 1 TB OneDrive, Teams, SharePoint) and continuous feature updates including AI Copilot. Access to 365 apps stops within 30 days if you stop paying.
What is Windows Server Standard vs Datacenter?
Both run the same OS. Standard licenses 2 VMs per license and is best for physical servers or light virtualization. Datacenter licenses unlimited VMs and adds Storage Spaces Direct, Shielded VMs, and Software-Defined Networking — best for dense virtualization with 4+ VMs per physical host.
What is an LTSC license?
LTSC (Long-Term Servicing Channel) is Microsoft’s enterprise version for fixed-function devices — ATMs, medical equipment, kiosks — where stability is required and feature updates are undesirable. It has a 10-year support lifecycle and is available only through volume licensing. Not designed for general-purpose business PCs.
What is Software Assurance?
Software Assurance is a Microsoft add-on that provides upgrade rights to new software versions, training resources, and deployment tools alongside a volume license. Organizations with SA can upgrade to new OS or Office versions without repurchasing licenses — typically part of Open License or Enterprise Agreement programs.
Conclusion: Microsoft Licensing Made Simple
Microsoft licensing comes down to four categories: Retail (transferable, one PC), OEM (hardware-bound, not transferable), MAK (one key, many activations for IT deployments), and Subscription (ongoing access with cloud services). The right choice saves money and avoids compliance issues.
At SoftLicenseDeals you’ll find the full range: Windows 11 Pro retail and MAK keys, Office 2024 and Office 2021 licenses, Windows Server Standard and Datacenter, and MAK volume keys for IT deployments of any size — all with instant delivery and genuine Microsoft activation.