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Working with Company Emails and Meeting Appointments  105

Windows Mobile on your phone protects your Outlook emails through Secure/

Multipurpose Internet Mail Extension (S/MIME), which allows you to digitally sign 

and encrypt your messages.

Requirement 

S/MIME encryption and digital signatures for Windows Mobile-based 

phones are available only with Exchange Server 2003 SP2 or a later 

version that supports S/MIME. If you are not using one of these products, or 

have not yet synchronized, these options are unavailable.

Note 

You can encrypt a message with or without a certificate. However, to decrypt and 

read an encrypted message, you need a valid certificate.

Click Start > Messaging > Outlook Email.
Click Menu > New to create a new message.
Click Menu > Message Options.
From the Security list, select whether to encrypt only, sign the message only, 

or do both.
Click Done.

Open the Outlook email message that has been digitally signed.
At the top of the message, click View signature status.
Click Menu > Check Certificate.

To view the details of the certificate in the message, click Menu > View Certificate.

Note 

There are several reasons why a digital signature may not be valid. For example, the 

sender’s certificate may have expired, it may have been revoked by the certificate 

authority, or the server that verifies the certificate is unavailable. Contact the sender 

to report the problem.