Microsoft roadmap roundup – 14 September 2026 (SharePoint Stuff) — Purview lifecycle / DLP wave

Tag: S-2026-09-14-sharepointstuff-m365-roadmap-purview Type: article (third-party weekly digest of Microsoft’s public Microsoft 365 roadmap) Author(s): Anthony, SharePoint Stuff (practitioner blog) Date of source: 2026-09-14 Date ingested: 2026-09-16 Authority weight: medium — reproduces Microsoft roadmap entry text with roadmap IDs, so content is traceable; but it is second-hand, the Microsoft pages were not fetched in this capture, and every item is a Microsoft estimate that the roadmap itself says may change Raw file: S-2026-09-14-sharepointstuff-m365-roadmap-purview (/_raw_sources/S-2026-09-14-sharepointstuff-m365-roadmap-purview.md)

What it claims

The digest lists twelve Microsoft Purview roadmap entries added or changed in the week to 14 September 2026 (one launched, one rolling out, ten in development). Launched: retention policies can now be applied to Microsoft Planner content (486828). Rolling out: Endpoint DLP extends to Copilot+ PC Recall snapshots, letting custom policies prevent capture of windows containing restricted sensitivity labels or sensitive information types (560396). In development: network-layer DLP through Entra Global Secure Access Internet Access to intercept and inspect files leaving to untrusted cloud apps including generative-AI platforms — the entry records that “the GA release of this item has moved” (17 Jul update) and now shows September 2026 (522096); an archive-file classification behaviour change for Windows endpoints (570965, Oct 2026); DLP for Microsoft Cowork, giving “a single policy across Microsoft 365 Copilot and Cowork” that blocks labelled knowledge sources, prompts containing sensitive information types, and sensitive prompts going to Bing web search (570845, Oct 2026); the first release of Priority cleanup — a “secure workflow to bypass legal holds and retention policies” on the Exchange workload, requiring “a separate security role, multiple approvers” and carrying “a complete audit trail” (392838, Oct 2026); at-scale deletion of departed employees’ inactive OneDrives and mailboxes, “content and containers” (566527, Nov 2026); DLM insights and retention-policy recommendations on sensitive OneDrive/SharePoint data (562343, Dec 2026); a DLM billing-meter change under which non-Microsoft-365 generative-AI prompts and responses are billed by retained volume ($0.25/GB/month, equivalent to $6 per million text messages per month), with customers required to migrate meters and Microsoft expecting a cost-neutral-or-lower outcome (560324, Dec 2026); retention based on last-accessed date for SharePoint/OneDrive items (472030 Jan 2027; 565866 Feb 2027); and DLP Policy Change Insights with Security Copilot, letting admins prompt for coverage summaries of DLP policies (472031, Sep 2027). The digest offers no analysis of its own beyond the counts.

Notable quotes

• “Creating a Priority cleanup will require a separate security role, multiple approvers, and will have a complete audit trail.” (Purview → In development → October CY2026, roadmap 392838)
• “…enabling data security admins to use a single policy across Microsoft 365 Copilot and Cowork.” (roadmap 570845)
• “Updated July 17, 2026: The GA release of this item has moved. We apologize for any inconvenience.” (roadmap 522096)
• “Each non‑Microsoft 365 generative AI prompt and response is treated as an individual text message and is retained and deleted according to the configured Microsoft Purview retention settings.” (roadmap 560324)

What’s speculative vs. asserted

• Asserted (as relayed Microsoft roadmap text): the feature descriptions, roadmap IDs, status buckets (launched / rolling out / in development) and target months listed above.
• Explicitly provisional in the source itself: all “In development” target months are Microsoft estimates; the 522096 entry shows a date already moved once. The DLM meter’s “cost-neutral or lower” outcome is Microsoft’s own “current analysis”, not a customer-verified figure.
• Not stated by the source: whether the Priority cleanup audit trail is exportable or retained; how DLP-for-Cowork relates to the June 2026 GA “protections for Microsoft 365 Copilot Cowork” already on Microsoft’s changelog; what “multiple approvers” means numerically.
• Not independently verified in this capture: none of the Microsoft roadmap pages were fetched.

Topics this feeds

• Microsoft Purview — new items folded in (Priority cleanup hold-bypass workflow; DLP for Cowork; Recall-snapshot endpoint DLP; Planner retention; DLM meter change; last-accessed retention; Security Copilot policy insights); dating updates for network-layer DLP GA and departed-user deletion; two dating tensions recorded.

Open questions raised

• Is the October 2026 “first release of Priority cleanup” (Exchange) the same capability whose three-approver requirement Hoitingh reported as already in place in July 2026 — i.e. is Hoitingh describing SharePoint/OneDrive and this entry Exchange — or has the feature slipped? (See Tensions on Microsoft Purview.)
• Does “DLP for Microsoft Cowork” (Oct 2026) extend, or merely re-announce, the June 2026 GA Cowork protections?
• Under the new DLM meter, do firms retaining AI prompts/responses for regulatory record-keeping face volume-driven cost exposure that changes retention-policy design incentives? Not addressed by the source.