There is a trick you can try to get the stand alone mail exe.
Go to
http://www.download.windowsupdate.com/msdownload/update/v3-19990518/cabpool/
Click the "Download" icon and then cancel it. You will then be offered the WLmail download.
I believe that maybe they thought Windows Mail was so like a rebadged OE, that they dropped it. In fact, if you browse somewhere way back, you will find that it was OE 6. It was actually, in some ways, a step down from OE 5. For example, In OE, you could choose between POP3, IMAP, and HTTP mail server types; the latter was used for Web mail accounts. In Windows Mail, that last option was eliminated. Only POP3 and IMAP accounts were supported.
Windows Mail had some features that made it a litle safer than OE.
It had the Junk Mail filter, as found in Microsoft Outlook. (but not to IMAP accounts). It also introduced the Phishing filter.
Windows Live Mail works, by design, fualtlessly with Live Hotmail and MSN email services. It also uses any POP3 or IMAP email account as was the case with Windows Mail. Windows Live Mail can, with ease of setup, access two or more email accounts simultaneously, of any nature. (They do not need to be "live" accounts)"
" Next thing you know Internet Explorer will only be available in the Windows Live download. " Getting closer to reality even as we speak!!!!