Outlook on the Web Mailbox Policies
The question it answers: Which Outlook on the web policies allow attachment downloads and offline mail on unmanaged computers?
Outlook on the web works from any browser. Unless the OWA policy limits it - and a Conditional Access policy with ‘Use app enforced restrictions’ enforces it - attachments can be downloaded on any unmanaged or public computer, saved to third-party storage, or cached for offline use.
At a glance
Section titled “At a glance”| Where in the app | Exchange Online › Mail Security & Hygiene › OWA Mailbox Policies |
| Workload | Exchange Online |
| Kind | Findings list · dashboard tile |
| Data | Read from Microsoft 365 when someone first opens it, then kept for the report cache lifetime (Settings > Data & cache, 1 hour unless changed). It reads through PowerShell (Exchange Online or SharePoint Online), so the first load takes longer than a Graph report. |
| Licence | None; ‘app enforced restrictions’ needs Entra ID P1 for the Conditional Access side. |
| Report id (API and MCP) | exchange.hygiene.owa-policies |
Columns
Section titled “Columns”| Column | Key | Type |
|---|---|---|
| Severity | Severity | Status |
| Policy | Category | Text |
| Setting | Subject | Link |
| Check | Setting | Text |
| Value | Value | Text |
| Finding | Finding | Text |
| Detail | Detail | Text |
| Date | When | Date |
| Mailboxes on policy | Number | Number |
A findings list hides columns that no row fills. Severity is Critical, Serious, Warning, OK or Info; rows rated Critical, Serious or Warning need attention (Working with findings).
What it needs
Section titled “What it needs”Licence: None; ‘app enforced restrictions’ needs Entra ID P1 for the Conditional Access side.
Application permissions on the IntensiveReports app registration (all permissions):
| Permission | API | What it allows | Note |
|---|---|---|---|
Exchange.ManageAsApp | Office 365 Exchange Online | Manage Exchange As Application | + View-Only Organization Management |
Data sources it reads
Get-OwaMailboxPolicyGet-CASMailbox (OwaMailboxPolicy)
Through the API and MCP
Section titled “Through the API and MCP”GET /ir-api/v1/reports/exchange.hygiene.owa-policies?size=100An AI assistant reads it with the MCP tool get_report and the id exchange.hygiene.owa-policies. The client needs the Read grant for Exchange Online. See Using the API.