Outlook Express message??

My apologies if you see this post more than once, since I'm not quite sure
which group to post it in, so I'll post it in a few that might be relevant.

For the last 3 days or so, I've had a message window appear when I boot up
Windows (XP SP3). It says "Outlook Express. To free up disk space, Outlook
Express can compact messages. This may take up to a few minutes." And then
the OK or Cancel buttons. I have always clicked Cancel.

Here's the weird thing -- I run Office Outlook (2003), NOT Outlook Express!
I've never run Outlook Express -- not on this Windows installation anyway.
Just in case this was an echo from Office Outlook, I compacted all my Outlook
PST files, but I'm still getting the message.

I find this message disturbing because, since I'm not running Express, I
wonder if it might be some kind of malware. But I run an anti-virus and
anti-spyware and firewall and I scan pretty much daily. It hasn't gone away
after scanning.

Has anyone else had this happen before, when you aren't running Outlook
Express? Thanks.
.

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