Many thanks for this solution, which has been driving me mad for ages!!

In Mac OSX 10.8.3 it works more or less fine for several thousand emails that I transferred from Outlook:mac 2011 to Apple Mail. All attachments were preserved as was the hierarchical structure. In one small folder all mail was in machine code. 160 ‘sent’ emails from 2009/2010 would not transferred.
I am now using Apple Mail and have said goodbye to Outlook – now uninstalled.

Thanks for Chris for directing me to Marcus’s site

Thanks very much

Expecting your reply on this soon

Rob:

OK team – I’vve found the answer on how to export Outlook for Mac 2011 emails and get them into the latest version of AppleMail. A point to note: I just upgraded to Lion.
1. Create a new folder in Finder to put all your email folders into.
2. Open Outlook and click and drag each folder into the above Finder folder. Note: You will need to expand the trees so you drag each folder rather than just master folders.
3. Open Mail.
4. Select the Inbox. Go File/Import Mailboxes and select the last option “Files in m.box format.” Click Continue.
5. Locate the above Finder folder into which you’ve dragged your Outlook folders. When you click the folder to import, it will do so.
6. Check in Mail and you will see the folder and it’s email contents will have been imported and placed down the bottom of the left hand side in a folder called “import.”
7. Once you’ve done the above for each Outlook folder you will then need to drag and drop inside Mail to rearrange the imported folders into the right order and heirachy.
Preserves all your emails, their dates etc in the correct order. Yahoo! Goodbye Microsoft.

I tried to purchase the software from the link at the beginning of the instructions. I paid via pay pal days ago and have not heard anything. Anyone have any advice or another software package that will work?

Thanx