ST-2026-265 · API & schema lifecycle
Microsoft Advertising extends SOAP feature parity until final deprecation
Microsoft extended its API migration calendar so new features remain available in both SOAP and REST until SOAP is fully deprecated on 31 January 2027.
Previous state
The April 2026 schedule said new features and enhancements would become REST-only on 1 October 2026, ahead of full SOAP deprecation.
Current state
New features and enhancements remain available in both SOAP and REST until full SOAP deprecation on 31 January 2027.
Affected users
Who needs to care
Microsoft Advertising API integrations planning around the former 1 October 2026 REST-only feature milestone.
Required response
What to do
Continue the REST migration, but update cutover planning to reflect SOAP feature parity until the unchanged 31 January 2027 final-deprecation date.
Evidence boundary
What the source does not prove
This is an enforcement-calendar amendment, not cancellation of the REST migration or extension beyond the documented final SOAP deprecation date.
Lifecycle history
Dated event sequence
- Original schedule
Microsoft announced a 1 October 2026 REST-only new-feature milestone and 31 January 2027 final SOAP deprecation.
- Feature milestone extended
Microsoft said new features remain available in SOAP and REST until final deprecation.
- SOAP deprecated
The final SOAP deprecation date remains unchanged.
Evidence ledger
First-party sources
- 01Microsoft Advertising — Less busywork, more growth: what's new in Microsoft Advertising this September
Official Microsoft Advertising API-enforcement authority · 2026-09-30
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