G'day Alan, a while back I had reason to be doing this and I used "O2M" on 
Ronni's recommendation. It is a $10 download and worked flawlessly, with all 
emails transferred, with attachments, subject line and folderising (not sure if 
that's a kosher word but gets the message I think) as you'd expect. perhaps 
this is worth a try. If you google "O2M" it is the first hit returned and their 
is a free trial version which will demo the process.

Regards

Peter.
On 17/03/2011, at 8:17 PM, Alan Smith wrote:

> 
> I cannot transfer my full email history from PC to iMac.  Any suggestions for 
> a remedy?
> 
> I converted my Microsoft Outlook emails to Thunderbird (3.1.9) on my WinXP 
> machine.   I copied the resultant mail file to my iMac and then used Mail 
> (4.4) to import the data.   All folders are imported but no folder has the 
> full tally of emails it should have - say  only 10 percent overall.   Some 
> folders are completely empty, some have a few emails, and others very precise 
> numbers of 100, 200 and 400 emails.   On comparing a block of transferred 
> emails with the source there are individual emails missing as well as from 
> beginning and end.
> 
> Within Mail I deleted the Import mailbox several times.   I copied the 
> Thunderbird mail file to two different USB thumb drives.   I copied the USB 
> file to desktop for another Import test.  It seems that I'm getting a 
> consistent data transfer whatever the method.   Even USB is too fast to read 
> the individual email subject as it is being imported, but I'm sure I 
> recognised some names that belonged inside a subsequent empty folder.
> 
> I cleaned up the Outlook emails and folders before converting to Thunderbird. 
>    Including the Archive files, total mail folder is about 650MB.   I only 
> want the Personal files, but I did one test with both Archive and Personal 
> streams - the same incomplete pattern of emails happened.
> 
> Regards, Alan
> 
> Alan Smith
> iMac 21.5" Nov 2009
> Intel Core 2 Duo 3.06GHz/4 MB
> OSX 10.6.6 Snow Leopard
> 
> 
> 
> 
> 
> 
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