MC1466753 High Major change
(Updated) Microsoft Word: Similarity Checker retirement
Summary AI-generated
Similarity Checker in Microsoft Word will be retired on October 3, 2027 and will no longer be available in the Editor experience. Other Editor features and Copilot are not affected.
Suggested actions AI-generated
- Review workflows that depend on Similarity Checker
- Inform users about the retirement
- Evaluate alternative solutions for similarity validation
- Update documentation or training materials
Written by Azure OpenAI (gpt-4.1) from the text of the post below. It can be incomplete or wrong; the original post is authoritative.
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Original post from Microsoft
Updated September 10, 2026: We have updated the timeline. Thank you for your patience.
[What and why]
We are retiring Similarity Checker in Microsoft Word on October 3, 2027. After the retirement date, Similarity Checker will no longer be available as part of the Microsoft Editor experience in Word.
This change allows us to focus on experiences and capabilities that are more broadly used across Microsoft Word.
[Rollout schedule]
- Worldwide, GCC, and DoD: Beginning early October 2027
[Impact on your organization]
Who is affected
- Organizations and users that currently use Similarity Checker in Microsoft Word
Platforms and services
- Microsoft Word
- Microsoft Editor
What will happen
- Similarity Checker will be removed from Microsoft Word.
- After retirement, users will no longer be able to access Similarity Checker through the Editor experience in Word.
- Other Microsoft Word writing, editing, and citation capabilities will not be affected.
- Microsoft Editor will continue to provide spelling, grammar, clarity, and style suggestions.
- Microsoft 365 Copilot capabilities in Word are not affected by this change.
- Note: Copilot is not intended to serve as a formal similarity, plagiarism, or originality validation tool.
[Action required and recommendations]
No action is required.
If your organization currently uses Similarity Checker:
- Review workflows that depend on Similarity Checker.
- Inform users who rely on the feature about the upcoming retirement.
- Evaluate alternative solutions if formal similarity or originality validation is required.
- Update internal documentation or training materials that reference Similarity Checker.
[Compliance considerations]
No compliance considerations identified. Review as appropriate for your organization.
Additional details from Microsoft
- Summary
- Microsoft Word's Similarity Checker will be retired on October 3, 2027, and removed from Microsoft Editor. Other writing and editing features, including Microsoft 365 Copilot, remain unaffected. Organizations should review workflows, inform users, and consider alternatives if needed. No action or compliance issues are required.