BlackBerry® Internet Service implements the following security features: user authentication, content and message encryption and wireless delivery. User authentication Subscribers are required to provide a unique user name and password combination to access the BlackBerry® Internet Service. The maximum number of failed logins is three times after which the subscriber is locked out. Subscribers can be ‘unlocked’ by waiting for the lockout period (4 hrs) to end. If subscribers forget their password, they can enter their PIN number or the unique username and the system sends the password to the handheld. Content encryption Information that is exchanged between the web server and the user through BlackBerry® Internet Service is encrypted using SSL. This encryption verifies the content including user names, passwords and other account information. Message encryption Messages are encrypted using SSL when supported by the email server (POP over SSL, IMAP over SSL, Outlook Web Access (OWA), and iNotes). If the email server does not support an SSL connection, a standard non-secure HTTP connection is used. Wireless delivery Messages that are sent and received between the BlackBerry® Internet Service and the subscriber's handheld are not encrypted. When these messages are transmitted over the wireless network, they are subject to the existing or available network security model(s).