Opselith
POWERSHELL / EXCHANGEONLINEMANAGEMENT
ProAdvancedRead-onlylow

Export shared mailboxes without explicit FullAccess assignments

Find Exchange Online shared mailboxes without explicit Full Access user assignments and export them to CSV for delegation review.

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Generated securely after server-side Pro license validation · Review before running · Opselith does not connect to your tenant

What this PowerShell script does

Finds shared mailboxes that have no explicit FullAccess assignment other than system principals.

Requirements

  • CSV output path - Example: C:\Temp\report.csv

Environment

  • Module: ExchangeOnlineManagement
  • Permissions: Mailbox permission read access
  • Output: CSV report
  • Context: PowerShell 7 · Exchange Online
  • Risk: Low
Review before you run The script is generated securely after server-side Pro license validation. Test outside production first.
NEXT STEP

Ready to generate

Configure Export shared mailboxes without explicit FullAccess assignments in the Builder, review the generated PowerShell and run it yourself in your own PowerShell session.

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More about this script

Why use this template?

Use this PowerShell template when you need to find shared mailboxes that have no explicit FullAccess assignment other than system principals. It can be previewed in the Builder; Pro access is required to generate it for your own environment.

The template uses ExchangeOnlineManagement and requires Mailbox permission read access. Output: CSV report. Level: Advanced. Action: Read-only. Risk: Low.

Review before running

The script remains preview-only until Pro access is enabled. Review it before running it, and test it outside production first. “Read-only” describes the script itself; anything you add around it can still change data.

Preview the script

  1. Open the template in the PowerShell Builder.
  2. Review the purpose, requirements, permissions, output and risk.
  3. Activate Pro when you are ready to generate the full script, then test it outside production.

Pro templates remain previewable before purchase or activation. No tenant connection is required. When you generate a Pro script, only the configuration values needed for that template are sent to Opselith after license validation.Preview Export shared mailboxes without explicit FullAccess assignments →

How to use this result

Use this report to find shared mailboxes where no explicit Full Access user assignment remains after system principals are excluded.

When this helps

  • Review shared-mailbox delegation before migration or ownership cleanup.
  • Find shared mailboxes that may no longer have an obvious interactive user delegate.
  • Create a focused follow-up list instead of reviewing every mailbox permission row manually.

How to read the result

  • Full Access allows a delegate to open and work with mailbox contents; it is separate from Send As and Send on Behalf permissions.
  • No explicit Full Access user assignment does not prove a mailbox is unused: access can be provided through groups or other delegation patterns that require separate review.

Things to check

  • Treat the result as an investigation list, not an automatic deletion or ownership decision.
  • Review Send As, Send on Behalf, group-based access and the mailbox's business purpose separately.

What to do next: Check the mailbox's business owner and other delegation paths before deciding whether the lack of an explicit Full Access user assignment is a problem.

Related tasks

Official references

Before you runModule, permissions, inputs, compatibility and script checks
OPS / SCRIPT DETAILS

Script details

Finds shared mailboxes that have no explicit FullAccess assignment other than system principals. Review these details before generating or running the script.

securityexportfindpermissionsmailboxexchangeownership
Generated here. Run by you.Opselith does not connect to your tenant or run PowerShell. After generating, review the script and run it in your own PowerShell session.

What it works with

Module: ExchangeOnlineManagement

ExchangeOnlineManagement lets PowerShell connect to and work with Exchange Online.

Context: PowerShell 7 · Exchange Online

Compatibility: PowerShell 7 is the supported target for this Microsoft 365 template.

Permissions and changes

Permissions: Mailbox permission read access

Risk: Low

Read-only: designed to collect information without intentionally changing the target environment.

Changes: Read-only. The script reads data and does not intentionally change the target environment.

Inputs

  • CSV output path - Example: C:\Temp\report.csv (Required)

What to expect

Output: CSV report

Expect a CSV file at the path you choose. Open it in Excel or another CSV viewer and review the rows.

Example: C:\Temp\report.csv

This template is in the Pro library. Generating the full script requires eligible Pro or tester access. Opselith receives only the values needed to build the script; it does not connect to your tenant, run PowerShell or store the generated script. You review and run the result in your own PowerShell session.

Example use

Finds shared mailboxes that have no explicit FullAccess assignment other than system principals.

Enter the required values in the Builder, review the generated script and confirm the output before running it.

Before you run: Make sure your account has Mailbox permission read access. Check that the ExchangeOnlineManagement PowerShell module is available and that you are using the supported PowerShell version. Review the generated script and output path, then test outside production first.
Script checksWhat has been verifiedQA reviewed
Static checksPassed
PSScriptAnalyzerPending
Real-world run testNot yet recorded
Last checkedNot yet recorded

Real-world run results are shown only after Opselith reviews and accepts a tester report.

Tester: report a result →
TEST STATUSWhat Opselith has checked

Last reviewed: 10 Sept 2026

PSScriptAnalyzer: Awaiting a release PSScriptAnalyzer gate that includes this script. No analyzer pass is claimed yet.

Pending or Not yet recorded means there is no accepted result on file yet. A passed analyzer check does not mean the script has been run in a real tenant.

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