Creating a mailbox
To create a mailbox for the user imamsxadmin (Exchange domain), do the following:
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Open the Exchange admin center.
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Go to the following folder:
Microsoft Exchange On-Premises (<domain>)\Recipient Configuration
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Click New Mailbox….
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Choose User Mailbox.
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Click Existing Users.
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Click Add….
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Choose the user imamsxadmin.
You can now see the PowerShell commands.