Trying to understand the meaning of the Powershell term 'Unlimited' for users whose storage quota setting is set to Default. "Unlimited" also shows for users whose storage quota is truly set to unlimited and not using the database defaults.
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8/22/2022 - Mon
Sushil Sonawane
Please refer below link to see user mailbox quota limits.
There is a correction..
I have done some testing by setting the UseDatabaseQuotaDefaults of user mailbox to $null. It appears that, even the GUI and PowerShell shows the mailbox limit is set as Unlimited, the actual limit applied to mailbox is from database. Which means Null is considered as True (If any mailbox is set to UseDatabaseQuotaDefaults as null, then the limits set on Database will take precedence.)
http://help.outlook.com/en-in/140/gg576861.aspx
http://smtpport25.wordpress.com/2009/06/30/powershell-to-get-mailbox-lists-who-is-out-of-default-quota-limits/