Admin Audit logs.

Question

We want to know who has created a contact in office 365. Can we get the result with the help of PowerShell command as we have lots of admin audit log entries in our tenant.

Answer 1

Are we talking about a contact within a mailbox, or a contact created in the GAL? For the former, you need to check the mailbox audit log as detailed here: https://learn.microsoft.com/en-us/microsoft-365/compliance/enable-mailbox-auditing?view=o365-worldwide
Keep in mind that owner actions are NOT audited by default, so if this is a user mailbox and the owner created the contact, you'll find no record on it.

If it is a GAL contact, run a search against the Admin audit log/Unified audit log: https://learn.microsoft.com/en-us/microsoft-365/compliance/search-the-audit-log-in-security-and-compliance?view=o365-worldwide

Answer 2

You will need to search the Audit Log for any the following operation: New-MailContact

Connect to Compliance and Security powershell module: https://learn.microsoft.com/en-us/powershell/exchange/connect-to-scc-powershell?view=exchange-ps

Verify if the audit log is enabled for your tenant: Get-AdminAuditLogConfig | FL UnifiedAuditLogIngestionEnabled

Make sure you have the required permissions: You have to be assigned the View-Only Audit Logs or Audit Logs role in Exchange Online to search the audit log. By default, these roles are assigned to the Compliance Management and Organization Management role groups on the Permissions page in the Exchange admin center.

Use the following command: https://learn.microsoft.com/en-us/powershell/module/exchange/search-unifiedauditlog?view=exchange-ps
Example: Search-UnifiedAuditLog -Operations New-MailContact

NOTE: audit log are subject to retention policies defined by default by Microsoft, 1 year for E5 users and 90 days for non-E5 users.
Details: https://learn.microsoft.com/en-us/microsoft-365/compliance/search-the-audit-log-in-security-and-compliance?view=o365-worldwide

Answer 3

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Answer 4

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