Please add to:
Alfresco Documentation > Using Alfresco > Using Alfresco Explorer Enterprise Content Management > Getting Started
Mapping an Alfresco space to a drive
The information from:
and set HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\Internet
BasicAuthLevel = 2
which lets Office 2010 open files from an webdav drive mounted over a non-secure connection.
Office 2010 is becoming very popular and a lot of customers seem to be using it to access Alfresco over webdav. They will usually be using it over non-SSL.