If you have an Office365 account, you likely know that you have 50GB worth of storage space. However, it is not obvious how much of that 50GB limit you are currently using. Questions like: ‘How large is all of my email’, ‘How much space do I have left in my Office365 email?’ and ‘What is my mailbox usage on Office365?’ need answers.
There are four ready ways to determine the size of the mailbox in Office365:
You could look at the size of the mailbox you have in Outlook and use that as a pretty solid gauge of how much did you are using.
If you are an Administrator Office365, you can see each users mailbox size by:
If you are an Administrator Office365, you can see each users mailbox size using the following PowerShell command which I borrowed from THIS post.
Function Connect-ExchangeOnline {
$office365Credential = Get-Credential
$global:office365= New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $office365Credential -Authentication Basic –AllowRedirection
Import-PSSession $office365
}
Get-Mailbox | Get-MailboxStatistics | Select-Object DisplayName, IsArchiveMailbox, ItemCount, TotalItemSize | Format-Table –autosize
OR
Get-Mailbox | Get-MailboxStatistics | Select-Object DisplayName, IsArchiveMailbox, ItemCount, TotalItemSize | Export-CSV –Path “C:\Logs\ExchangeOnlineUsage.csv”
If you are wondering how it was so easy to fill up your 50GB, it is because Office365 now allows attachments up to a MASSIVE 150MB per message. This might sound like a great idea but most email systems you are sending to will block messages larger than 10MB or 15MB and it will also be difficult to find and work on files that you have in Exchange, because it is not a file system… it is an email system and with very few exceptions you should use it that way.
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