MS-721 deep review — September 28, 2026

Read the entire guide and mapped all 173 April 28 objectives in nineteen groups. Official objective/status hashes are unchanged; no upcoming revision is announced. The credential lists 100 minutes. Preserve the accepted baseline.

Learning changes

Add six worked examples, two labs (ten total) and twelve answered checks (48 total). Expand Shared Calling and SMS accounting, routing order/SBA/media, emergency location, event/AI policy, voice funding, interop, Android portal migration/AOSP, XML processing, release/version evidence and desk association. Source-specific exceptions remain explicit instead of applying one policy rule to every workload.

Source and blog decisions

Read current primary documentation for each added operational boundary. The Android management transition’s explicit readiness/profile-import instructions take precedence over its broad FAQ reassurance about migration. Migration does not establish that settings, delegation or recovery work. General emergency routing prose must be read with the specific Shared Calling procedure. Current September SIP documentation includes Android; the May provider synopsis’s future wording is historical.

The public Empowering.Cloud interop synopsis is presented by Tom Arbuthnot with Pexip’s Marius Nilsen, and discloses AI-assisted, team-reviewed summaries. It supplies a comparison exercise, not independent proof of vendor performance; the video was not watched. The July Microsoft Teams main article supplies a bounded room-readiness exercise. Neither blog proves that a tenant’s device fleet already has the advertised capability.

Public catalogs show fifteen Learn modules, five Pluralsight courses totaling 8h04, and 167 MeasureUp questions. Historical Learn runtimes are qualified; the O’Reilly page was blocked. Paid content, practice questions, videos and complete April coverage were not inspected.

Validation boundary

Offline synthetic arithmetic and routing/location/association checks support the examples. No tenant, SMS, carrier call, emergency test, VDI, room, SIP, device, portal, network diagnostic or external lab was executed. Final local unit/repository/site gate results are recorded in ADLC_Docs/operations/2026-09-28-ms-721-deep-review.json. This is same-context AI work; independent human review remains pending.