🔁 Step-by-Step Guide: Restoring Primary and Archive Mailboxes in Exchange Online via PowerShell
Mailbox restoration is a critical operation in any Microsoft 365 environment, especially when a user’s mailbox has been removed, replaced, or re-provisioned. Whether you’re recovering a deleted mailbox or restoring mailbox content to a newly created user, Exchange Online offers a powerful way to perform this using PowerShell.
This guide walks you through the process step-by-step—including how to identify mailbox GUIDs and restore primary and archive mailboxes.
✅ Prerequisites
- Global or Exchange Administrator rights
- Exchange Online PowerShell module installed
- Target mailbox created and licensed
- Mailbox should be empty for clean restoration
🧭 Step 1: Connect to Exchange Online PowerShell
Connect-ExchangeOnline -UserPrincipalName youradmin@domain.com🔍 Step 2: Get Mailbox GUIDs
2.1 Source Mailbox GUID
Get-Mailbox -SoftDeletedMailbox -Identity user@domain.com | Select DisplayName, ExchangeGUID2.2 Target Mailbox GUID
Get-Mailbox -Identity newuser@domain.com | Select DisplayName, ExchangeGUID📦 Step 3: Archive Mailbox Explained
An archive mailbox is additional mailbox storage for older emails. It supports auto-expanding storage up to 1.5 TB. Enable it using:
Enable-Mailbox -Identity user@domain.com -Archive🔄 Step 4: Restore Primary Mailbox
New-MailboxRestoreRequest -SourceMailbox <Source-GUID> -TargetMailbox <Target-GUID> -AllowLegacyDNMismatch📂 Step 5: Restore Archive Mailbox
New-MailboxRestoreRequest -SourceMailbox <Source-GUID> -SourceIsArchive -TargetMailbox <Target-GUID> -TargetIsArchive -AllowLegacyDNMismatch📊 Step 6: Monitor Restore Progress
Get-MailboxRestoreRequest | Get-MailboxRestoreRequestStatistics🧹 Step 7: Cleanup
Get-MailboxRestoreRequest -Mailbox newuser@domain.com | Remove-MailboxRestoreRequest📝 Additional Tips
- Restore requests merge content; they do not overwrite
- Valid within soft-deletion retention (default 30 days)
- Use
-AllowLegacyDNMismatchif DN doesn’t match
📬 Conclusion
Using PowerShell for mailbox restoration in Exchange Online ensures full control and detailed monitoring. Following this guide helps restore both primary and archive mailbox content safely and efficiently.
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