Abstract: Data management methods and systems for handheld devices are provided. First, a plurality of email messages are displayed in a first display area of a touch-sensitive display unit, and at least one tab icon is displayed in a second display area of the touch-sensitive display unit, wherein the tab icon records at least one condition, and the condition is used to determine whether the respective email message has a flag or has a meeting invitation format. A contact corresponding to the tab icon on the touch-sensitive display unit is detected, and in response to the contact, at least one candidate email message having the flag or having the meeting invitation format is filtered from the email messages according to the condition corresponding to the tab icon, and the candidate email message is displayed in the first display area of the touch-sensitive display unit.