Windows Live Mail is a free Email client that supports access of Hotmail, POP3, and IMAP accounts.
It is a replacement of Microsoft Outlook Express in terms of the capability of accessing a Hotmail account. Outlook Express accesses Hotmail accounts via a Webdav based protocol. In April 2008, Microsoft announced that Hotmail access through WebDAV
would be entirely discontinued by 30 June 2008, in favor of the
Microsoft-proprietary DeltaSync protocol.
Windows Live Mail supports the DeltaSync protocol technique of accessing Hotmail accounts.