The hotfix default to disabling that format (to help prevent spoof sites which use
www.ebay.com@dodgysite.com) but you can re-enable it off by editing the registry key. For those interested the key is:
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_HTTP_USERNAME _PASSWORD_DISABLE]
"iexplore.exe"=dword:00000000
"explorer.exe"=dword:00000000
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Oh, the alternative work around is to go to
ftp://upload.ntlworld.com
then click "file" then "log in as"