Proofing Tools are the components that enable spell checking, grammar checking, thesaurus, hyphenation, and auto-correct in a specific language. While English (US/UK) comes standard with every Office installation, additional languages require these specific language packs.
A typical proofing tools package for a single language includes: office 365 proofing tools offline installer
If your organization has a Volume Licensing agreement (Open, EA, MPSA): Proofing Tools are the components that enable spell
For volume licensed versions, Microsoft provides .img or .exe language packs.
These are not freely available for retail Office 365 — you need a Volume Licensing agreement. “Microsoft 365 Apps for enterprise – Language Pack”
Search inside Microsoft Volume Licensing Service Center (VLSC) for:
“Microsoft 365 Apps for enterprise – Language Pack”
| Feature | Online Download | Offline Installer | | :--- | :--- | :--- | | Internet Required per PC | Yes | No (after download) | | Bandwidth Use | High (repeated) | Low (one-time) | | Air-gapped Networks | Impossible | Possible | | Mass Deployment | Slow & unreliable | Fast & consistent | | Control over versions | Limited | Full control |