5. The method of claim 1 , further comprising: increasing a time remaining in respective ones of said idle timers in response to detecting a user performing a specific operation on said associated ones of said content items in said active subset of said set of content items.
5. The method of claim 1 , further comprising: increasing a time remaining in respective ones of said idle timers in response to detecting a user performing a specific operation on said associated ones of said content items in said active subset of said set of content items. 7. The method of claim 5 , wherein said set of content items comprises a set of electronic mail messages, and wherein said specific operation comprises at least one operation from the set of operations consisting of reading said associated electronic mail message, replying to said associated electronic mail message, forwarding said electronic mail message, and modifying a draft response to said electronic mail message.