最重要的是保持信息的UID ，资料夹和邮件。
Most important is to keep UID information for folders and messages.
当档案第一次被检查过后，任何此档案的复本同样迅速地被鉴定，即使假如它位于其他的路径、在资料夹之中或在邮件的附件里。
After a file has been checked for the first time, any copy of it is identified quickly as identical, even if it is located in another folder, in an archive or in a mail attachment.
邮件标题上的操作无法在此资料夹中执行。
Operations on message headers can not be performed in this folder.
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