Patent ID: 8069214

Claim:
A method for use in a computer system comprising an email system that generates and receives email messages, the email system managing a first plurality of email messages comprising at least some of the email messages generated and received by the email system, the computer system further comprising an extension system that interfaces with the email system and manages a second plurality of email messages comprising at least some of the email messages generated and received by the email system, the method comprising: (A) creating, by the computer system, an extender catalog that comprises a list of messaging identities and provides an index into the second plurality of email messages by providing an association between the extender catalog messaging identities and information that can be used to determine which of the second plurality of email messages belong to which extender catalog messaging identities, wherein the extender catalog comprises at least some information that is different than the information in a global address catalog (GAC) provided by the e-mail system, wherein the GAC comprises a list of messaging identities for an organization serviced by the email system and provides an index into the first plurality of email messages by providing an association between the GAC messaging identities and information that can be used to determine which of the first plurality of email messages belong to which GAC messaging identities.