What changed

• Selected conversations now show a chronological Unified Thread instead of only one isolated card.
• The same current-preview identity can show Outlook and Teams events in one history.
• Every event keeps provider provenance, timestamp and subject/context.
• RelayDesk Test Lab uses stable peer IDs and remains writable for local replies.
• Mobile uses the same thread inside the full-screen conversation drawer.
• Visible app marker updated to WEB 2.1.6 / RD1-216 – UNIFIED THREADS.

Architecture

Provider/Test streams -> normalization -> Combined Feed -> person identity key -> Unified Thread -> Attention Workflow -> RelayDesk client.

Truth boundary

The developer preview still uses deterministic Test Lab IDs and simple demo sender names. Production identity resolution must use provider identifiers, user-controlled contact linking and the ability to split an incorrect merge. RelayDesk must never silently merge unrelated people because their display names happen to match.