MC1466753 - Microsoft Word: Similarity Checker retirement

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, 20262027. 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 onearly October 3, 20262027

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.