Fact · Voice privacy and security
Microsoft says it does not use customer data to improve its Speech models.
Checked against its source on October 17, 2026
In the source's own words
“Microsoft does not use customer data to improve its Speech models.”
Speech service encryption of data at rest, Microsoft, Microsoft Learn, 2026, Custom speech and custom voice, Important note.
Open the original- What it measures
- The page sits under Speech service encryption of data at rest. It appears after the description of how custom speech and custom voice data is stored, so the statement is about the Speech service as a whole, as the page presents it.
- What it does not show
- This is a statement of Microsoft's policy on its Speech models, not a contract term, and it does not cover how long data is kept. The retention rules for transcription are on a separate page.