Apple Mail Problem

I am retiring my Powerbook G4 that has servred me well for 8 years. I have a Dual 2.3 G5 and the mail app is newer than the powerbook. All I want to do is migrate my saved emails from the powerbook to the G5. But it ain't working. I have tried saving them on a flash drive, using my network, but when I try to open the email. I get a wierd text file. The Mail version and OS 10 are newer on the G5. Please help.
And sorry if I'm not following protocall... first time poster.

Not sure about the Mail App, but is there an option to 'Export' your saved emails?

I would guess that the newer Mail App would have an 'Import' option to allow you to import your old emails from an older Mail App.

Man and I consider myself a pretty savy mac guy... those Apple software dudes think of everything! Almost. Thanks, the import worked fine.

Bill