How are the old ("O") status flags set?

To: mutt-users@xxxxxxxx
Subject: How are the old ("O") status flags set?
From: Justin Gombos <mindfuq@xxxxxxxxxxxxxx>
Date: Sat, 6 Nov 2004 07:54:59 -0700
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I just switched to a new ISP with new pop3/smtp servers, and mutt is
flagging all my new inbound mail as old.  The dates on these messages
are current.  Anyone have a clue why mutt would be doing this?

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