Version: 2.1
Scope: VSTO/COM patterns, Ribbon/UI state, and deployment hygiene.

• [ ] Explorer vs Inspector contexts are handled explicitly; no cross-contamination of state
• [ ] UI toggles reflect the current pane state reliably across windows
• [ ] COM objects are released deterministically; no event handler leaks
• [ ] Threading model is respected (UI thread affinity); no blocking calls in UI events
• [ ] Add-in startup and shutdown are resilient; failure does not break Outlook session
• [ ] Sensitive data is not stored in item properties unless encrypted and explicitly required
• [ ] Logging avoids PII and secret leakage; errors are mapped without oracle behavior

• [ ] Feature flags/config can disable risky features without redeploy
• [ ] Clear versioning and compatibility statement (Office versions, 32/64-bit, Office.js/VSTO)

• [ ] Provide diagnostic mode with safe redactions
• [ ] Add integration tests for ribbon callbacks and pane toggle logic

Version: 2.1 (Split)
Author: Wolfgang van der Stille

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