Use the Get-MailboxStatistics PowerShell CmdLet to retrieve mailbox size, item count, and more from a single or multiple mailboxes.
Office 365 Mailbox Size Report with PowerShell — LazyAdmin
How to Increase Mailbox Size in Office 365 using PowerShell
Find Office 365 Mailbox Size With PowerShell
How To Find Mailbox Sizes In Exchange Using PowerShell
Mailbox Size and Quotas in Exchange 2019/2016 and Microsoft 365
Export Microsoft 365 mailbox size report with PowerShell - o365info
Check Office 365 Mailbox Size - Active Directory Pro
Check Office 365 Mailbox Size - Active Directory Pro
Mailbox size in Microsoft 365 explained
Get Mailbox Last Login Office 365
Get mailbox size of all users in Exchange with PowerShell - ALI TAJRAN
Exchange Archives - Page 4 of 11 - Easy365Manager
Export Microsoft 365 mailbox size report with PowerShell - o365info