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I’m frustrated, puzzled

Disappearing e-mail folders

With Thunderbird V3.1.9 running on Windows XP I use the "unified folder" view with its tree structure to organize my saved e-mails. Twice now, a commonly-used folder with lots of e-mails in it has mysteriously disappeared from the unified folder display and the only way I can access it is to switch to the "unread folders" or "favorite" or "recent" view. Is there some way to get my wayward folder to reappear in the "unified folder" view?
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