01 | Exchange access
Email connected apps can lose access
Microsoft starts phased Exchange Web Services access changes on 1 October. Inventory every dependency, make the tenant setting explicit and choose retirement, Microsoft Graph migration or a controlled temporary allow list.
Owner: Messaging platform owner
Seven day action: identify every application ID and test the highest impact mail workflow.
Retain: app register, configuration export, test result and migration plan.
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- 01Inventory
- 02Allow or block
- 03Migrate
02 | Office support
Office 2021 loses security support
Support ends on 13 October 2026. The applications may continue to open, but Microsoft will stop technical support, bug fixes and security fixes.
Owner: Endpoint or workplace platform lead
Seven day action: inventory installations, select the supported target and start a representative pilot.
Retain: device inventory, target decision, pilot evidence and exception register.
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- NowInventory
- 13 OctSupport ends
- AfterNo security fixes
03 | Document automation
Legacy document processing can fail
Azure Document Intelligence API version 2.0 retires on 31 August 2026. The version in the actual request, not the product name, determines the exposure.
Owner: Application integration owner
Seven day action: find v2.0 calls and run a v4 regression set across representative documents.
Retain: endpoint register, change record, before and after outputs, sign-off and rollback plan.
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- 01Find version
- 02Test v4
- 03Validate output
