Get-MailboxStatistics

Exchange Online: Gets mailbox statistics for a specified mailbox

Script

#Requires -Version 5.1

[CmdletBinding()]
Param(
    [Parameter(Mandatory = $true)]
    [string]$MailboxId,
    [switch]$Archive
)

Process {
    try {
        $box = Get-Mailbox -Identity $MailboxId -ErrorAction Stop
        if ($null -eq $box) {
            throw "Mailbox not found"
        }
        $result = Get-MailboxStatistics -Identity $MailboxId -Archive:$Archive -ErrorAction Stop
        $result | ForEach-Object {
            $_ | Add-Member -NotePropertyName Timestamp -NotePropertyValue (Get-Date -Format "yyyy-MM-dd HH:mm:ss") -PassThru -Force
        }
    }
    catch { throw }
}

Customize

MailboxId string

Alias, Display name, Distinguished name, SamAccountName, Guid or user principal name of the mailbox

Archive switch

Off

Return mailbox statistics for the archive mailbox associated with the specified mailbox