Understand why Exchange Server databases might dismount and methods for remounting them to restore user access to mailboxes ...

In the Cached Exchange Mode, a copy of your mailbox is saved on your computer. The copy offers prompt access to your data and is often updated with the server that runs Microsoft Exchange.

Follow these steps to create a no-reply email address in Exchange Server/Microsoft 365 ... expand the Recipients section, select Mailboxes and click on Add a shared mailbox.