Strange behavior with Outlook 2007, IMAP and strikeout on delete

I have something strange happening. In my Outlook 2007 I have a rule directing mail to the Junk E-mail folder. That works fine. But when I go to that folder and delete the email, It does not sent it to Deleted Items, it puts a line through it. Not only that, but if I try to delete the now struck-through message, it duplicates it in the Junk E-mail folder also with a line through it:
junk email duplicating strikeouts, not deletingI've checked my Rules and aside from the recommended 'Clear categories on mail' (whatever that does), the only rule I have is the SPAM rule sending mail to the Junk E-mail folder if the string "[SPAM]" is in the subject.

On Home tab > Junk group > Junk > Junk E-mail Options, I have "Choose the level of junk e-mail protection you want:" set to 'No automatic filtering'.

In File tab > Account Settings > More Settings > Deleted Items, I have "Move deleted items to the following folder on the server:" set to 'Deleted Items'.

Deleting messages in other folders works just fine.

Any idea what's up? How to fix?
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Normally a strikeout like that means the sender of the message set an expiry time on the email.

This link will elaborate on my comment:
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
With Outlook the strikeout means "deleted, but not yet sync'd that to server". The Junk Mail folder might not be sync'd immediately, a delay of several seconds is quite common.
MarkAuthor Commented:
Roshan Ejaz: Interesting link, but no "Expires after:" is set on these messages.

The Junk Mail folder might not be sync'd immediately, a delay of several seconds is quite common.
If you'll notice the dates in the embedded image, these messages are from 1 1/2 weeks ago, not several seconds ago.
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MarkAuthor Commented:
More info: This behavior is not restricted to the junk folder. Today I tried deleting a couple of messages in the inbox and the same thing happened. Not all the messages I deleted, just 2. The ones I tried to delete were spam, but not marked as such in the subject. This phenomenon happens only with a small percentage of messages and they are always from spammers. Is there something a spammer could set in the message to prevent its deletion?
MarkAuthor Commented:
The problem was with a VIPRE anti-phishing add-in. It would remove the bogus URL, "delete" the original message, and insert the new message w/o the URL and with a brief statement describing what it had done. Apparently, this automated deletion does the strikeout thing with IMAP folders, regardless of the Outlook setting. The solution was to remove the VIPRE add-in.

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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Yes, that it's the typical behaviour of IMAP. If you modify the message, a new one is generated and the original one deleted. This happened to me e.g. for EE mails, where my Outlook VBA code modifies the subject.
MarkAuthor Commented:
I found the answer
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