Where can I find help guides for connecting mailboxes and forwarding email?

Deskhero links to how-to guides directly from the setup screens: "How to add a mailbox?" on the Add Mailbox dialog opens the connect-mailbox guide on deskhero.com, the forwarding screen links to a guide on forwarding emails to external domains, and the Microsoft connect screen links to a guide on configuring shared mailbox access in Microsoft 365.