Such a course as this might be immodest in another; but I have devoted upward of nine full weeks, first and last, to a careful and critical study of this tongue, and thus have acquired a confidence in my ability to reform it which no mere superficial culture could have conferred upon me.
Remove-ExchangeCertificate: The internal transport certificate cannot be removed because that would cause the Microsoft Exchange Transport service to stop. To replace the internal transport certificate, create a new certificate. The new certificate will automatically become the internal transport certificate.
You can delete Exchange Online mailboxes by deleting the corresponding Office 365 user account, removing the Exchange Online license, or by running the Remove-Mailbox cmdlet in the Shell. You can't use the EAC to delete a mailbox. When a mailbox is deleted, Exchange Online retains its contents for 30 days, by default.elete a user mailbox. Use the Office 365 admin center to delete a user account. When you delete an Office 365 user account, the corresponding Exchange Online mailbox is deleted and removed from the list of mailboxes in the EAC.