If Mailbox Importer fails to connect to the mail server, Mailbox Importer will attempt to connect to the mail server again after the Polling Period configured for the Mailbox Importer account. After the first failed attempt, the polling interval is doubled and the service will attempt to reconnect. For example, if the Polling Period is set to 1 minute, Mailbox Importer will attempt to connect again after 2 minutes. If this attempt fails, Mailbox Importer will again attempt to connect after 4 minutes. Regardless of the Polling Period value, the polling interval will only increase to 240 minutes (4 hours), and additional attempts are made every 4 hours until service is restored. A Failed message appears in the Diagnostics Console for each attempt.