Problem with Outlook Express 6.0 running on Win98

[Antonio Fernandez-Vicenti <afvaiv@xxxxxxxxxxxxxx>]

A friend of mine has a strange problem using her OutlookExpress6.0 under 
Win98:
Browsing her "Sent messages" folder, the list of messages appear as 
expected. Their Date values show the real date when they were sent.
But if you try to "resend" or "print" any message, the text you get says 
"Sent: xxxxxxx" and the date you see corresponds ALWAYS to TODAY's date, 
which is obviously not true...
Back to my home, I've checked with my own Outlook Express 6.0, and my 
Sent messages behave correctly as expected. But I use Win2000...
Asked another friend, running Win/XP, and his Outlook Express 6.0 
behaves also correctly.

Is there any "reason" why OE6.0 running on Win98 would show real Date 
values when browing the "Sent list", but alter them to TODAY's DATE if 
you try to resend/print them?
Searched through Google and different Forums, but found nothing similar...
Could it be a virus? So strange...
TIA