Mailbox Count

Get total number of mailboxes in cloud

 (get-mailbox).count

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Get number of mailboxes in particular Domain

(get-mailbox -resultsize unlimited | where {$_.primarysmtpaddress -like "*@example.com"} ).count

example.com --> write required domain name

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Get number of mailboxes in particular Distribution group


(Get-disributiongroupmember -identity "groupName").count


Group Name --> write required name of group