IncrediMail 2 offers you privacy options for your Identity. These will allow you to choose who can view your messages, when, and how:
On a computer with multiple Identities, you may not always want to have IncrediMail open directly to your personal mailbox.
You can have IncrediMail ask you which Identity to open on Startup, which will open to your Default Identity. You can also set a Password for this Identity.