Abstract: The present invention extends to methods, systems, computer program products, and data structures for decoupling an attachment from an electronic message that included the attachment. Generally, data fields of electronic messages and attachments are created in accordance with an electronic message schema hierarchy. Attachments are configured to have a data field indicating if the attachment is to persist when a corresponding electronic message is deleted. When an attachment persists, a user may be able to locate and use the attachment after a corresponding electronic message has been deleted (even if the attachment has not been expressly saved). Attachments are configured to include attachment metadata indicating properties of an electronic message that included the attachment. Accordingly, a user can access information (e.g., sender, subject, date, etc) associated with an electronic message (e.g., that included the attachment) even after the electronic message has been deleted.

Abstract: The principles of the present invention extend to efficiently and reliably providing message related data. Generally, data fields of electronic messages and attachments are created in accordance with an electronic message schema hierarchy. An electronic message can include links to folder items that represent message folders. An electronic message can also include links to contact items that represent message participants. Message applications can register for folder spaces such that each message application is aware of folders that are primarily controlled by other message applications. A link to a contact item can be selected to access current contact related data for a message participant, even when the contact related data has changed since an electronic message containing the link was received.