Abstract: Electronic mail messages are tracked for the sender by allowing the sender to flag the electronic mail messages. Flagging the electronic mail messages allows for various notifications to be provided to the sender. For example, notification may be provided to the sender by placing an item in a to-do bar for the sender that corresponds to the electronic mail message. As another example, notification may be provided to the sender by firing a reminder at some future time that corresponds to the electronic mail message. As another example, notification may be provided to the sender by including an indication in a related incoming electronic mail message that the incoming electronic mail message is related to the electronic message sent by the sender.

Abstract: A method for efficiently updating and displaying the hierarchy of a remote data store and displaying subfolder indicia indicating that child folders contain at least one subfolder. When a user expands a folder, an e-mail client displays a cached list of the expanded folder's contents. After the cached data is displayed, a list of the expanded folder's child folders and a list of the subfolders contained in the child folders are retrieved from the remote mail server. The retrieved data is sorted and compared to the cached list, and the cached data is updated to reflect the correct child folders and whether the child folders contain subfolders. The displayed hierarchy is then updated to reflect the state of the data that was retrieved from the server.