In Exchange 2010, you can add Active Directory attributes (such as
Company) to disclaimers and personalized signatures. When a disclaimer rule is triggered, the attribute names are replaced by corresponding values from the sender’s Active Directory user account. To use attributes in a disclaimer or personalized signature, you must enclose it in two percent signs (%%)
Exchange 2010 disclaimer text can include HTML tags. This allows you to create messages with the rich styling functionality available in HTML
User can personally update their AD information like address, phone no., first name etc via Exchange Control Panel and the same update would be reflected in the disclamier too.