Get-mailboxstatistics access denied
Clint Boessen's Blog: Exchange 2010/2013 - Get-MailboxStatistics TotalItemSize in Numeric Format
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EMS : Create reporting on the mailbox size - YouTube
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Export All On-Prem Mailboxes and Total Size using Powershell
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Postfachgröße und Kontingente in Exchange 2016/2019 und Exchange Online konfigurieren | WindowsPro
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Office 365 Mailbox Size Report with PowerShell — LazyAdmin
