HTTPMail returns for Leopard: Hotmail in Mail
Daniel Parnell has released an initial Leopard-friendly version of HTTPMail (1.50), a plugin for Mail.app that fools Hotmail and MSN web-based email accounts into downloading POP emails into Mail.
It basically does the same thing as MacFreePOPs, now also released for Leopard.
The plugin comes in a disk image with an installer and a detailed PDF on how to use it.
Daniel provides a handy list of how far the Leopard development has come:

He also outlines how to set up a Hotmail account in Mail.app using the plugin. He reminds users that older free Hotmail and MSN accounts will probably work but that newer one may need to be upgraded to Hotmail Plus
.
HHTPMail is freeware and available from Daniel’s web site
(but not yet from its sourceforge page
).
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November 16th, 2007 at 12:53 am
Works like a dream. I hope it works consistently across all my machines. It did ot on Tiger which makes little sense to me. But, as long as it does at work I am a happy camper. I don’t use this account that much but it does still get some important mail from time to time. Thanks!
November 16th, 2007 at 9:41 pm
I have loaded this and it works…. BUT every time I re-open Mail… it creates another full hotmail folder and replicates all my messages…
Currently I have 4 full hotmail folders.
How do I stop this?
November 16th, 2007 at 10:15 pm
Better not ask me. I could say anything! Better ask the developer. His email address is in the PDF in the disk image.
November 16th, 2007 at 10:21 pm
Actually… In fairness… the problem seems to have sorted itself out.
I deleted all the hotmail folders and account… all 4 of them. Now works fine.
I think this occurred as I UPGRADED to Leopard and it may have been confused with the HTTP setting I had with the previous OS.
Sorted and happy