Exactly! I did not get any notice that this new OS was going tom break anything so serious on my Mac. Not Apple!
I have talked to Apple Support directly since I posted this issue and seen other articles on the web. Apple removed Rossetta from the OS, which provided support for the PowerPC processor architecture.
I installed a trial version of Microsoft Office 2011 for Mac and I was able to import all of my Entourage 2004 mailboxes into Outlook 2011. However, I am unable to export said mailboxes in ANY format that Mac Mail can then import!
Microsoft does not offer any version of Office 2011 as an upgrade, so I am forced to buy a full version at $279.00 in order to keep my messages.
I have also seen other ways to get the messages out of Outlook if I drag the individual messages onto my desktop. The messages will appear as .eml files, which Mail can then open. But I don't want to have to do this for 1000+ messages.
A little disgusted with the whole situation.... :op