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			Collections Collections are dynamic organizing mechanisms for people to gather, group, and structure messages in Remail. The main device for organizing email, collections are similar to folders in conventional email clients with the following exceptions: People can customize and set rules to automatically pull items from an in-box and other document sources into collections. Customizing rules can be as arbitrary as the user prefers. People can also manually add and remove documents to and from collections. Users can create both "out-of-sight" collections and "in-sight" collections. An out-of-sight collection behaves like a conventional email folder, physically moving a message out of the in-box and into another folder. This has become a popular mechanism for organizing email messages. However, some users leave messages in the in-box as reminders, indicating that conventional folders take messages out of sight and out of mind. To accommodate a combination of these preferences, we allow users to create both in-sight and out-of-sight collections. A message that is part of an in-sight collection is visible in both the in-box and in the collection itself, while a message that is part of an out-of-sight collection is only visible in the collection. Users can put a message in multiple collections at once. This allows them to organize messages according to their own preferences and habits. Users are able arrange their collections in any vertical order they choose by clicking and dragging the collection containers. This allows people to organize their collections based on their own priorities rather than the traditional alphabetical order.