PowerShell - Check Archive Mailbox Size

Check In-Place Archive Mailbox Size

Single Mailbox

Archive Used

Get-MailboxStatistics [email protected] -Archive | Select DisplayName, TotalItemSize, ItemCount

Archive Max

Get-Mailbox user@domain | Select ArchiveQuota, ArchiveWarningQuota

All Archive Mailboxes

Get-Mailbox -ResultSize Unlimited | Get-MailboxStatistics -Archive | Select DisplayName, TotalItemSize | Sort TotalItemSize -Descending

Notes

• The -Archive switch is required — without it, the command returns primary mailbox stats instead of the archive.
• Must be connected to Exchange Online PowerShell first: Connect-ExchangeOnline

Get-MailboxStatistics [email protected] -Archive | Select DisplayName, TotalItemSize, ItemCount