I am migrating to a new computer as the old one gradually dies. I installed
Office XP on the new (Win 7) system and copied over my Outlook pst file to
the new system. so far so good.

I started receiving my e-mail on the new system for a while. Then I had to
do some work on the old computer and accidentally received a number of
e-mails there. (never mind how I had the accident, please)

How can I transfer these e-mails to the new system without messing up the
messages I already have there? The e-mail address is unchanged.

Thanks,