Before you install Office 2021 Professional Plus, check that your computer meets the requirements below. Most computers made in the last ten years will run it without problems.
| Component | Requirement |
|---|---|
| Operating system | Windows 10 or Windows 11 (32-bit or 64-bit). Windows 8.1 and older are not supported. |
| Processor | 1.1 GHz or faster, 2 cores |
| Memory (RAM) | 4 GB for 64-bit, 2 GB for 32-bit (8 GB recommended for comfortable multitasking) |
| Disk space | At least 4 GB of free space |
| Display | 1280 x 768 resolution or higher |
| Graphics | Hardware acceleration needs a DirectX 9 or later graphics card with WDDM 2.0 or higher |
| Internet | Required to download, install and activate Office, and to receive updates |
Tips before installing
- Choose the 64-bit version unless an old add-in requires 32-bit.
- Uninstall any trial or older Office version first, to avoid activation conflicts.
- Install the latest Windows updates.
- Keep your 25-character product key at hand for activation.
Ready to buy? See Office 2021 Professional Plus. Note that Microsoft ended support for Office 2021 on October 13, 2026. For a version supported until 2029, see Office 2024 Professional Plus.