I have encountered a very strange behavior regarding the WebDAV functionality:
Case 1: I start a downloaded liferay 6.2.0 m6 tomcat bundle on port 8080 on my machine and connect from a Win XP machine via WebDAV to the document library. Everything works just fine.
Case 2: I start the same liferay but with tomcat connector port 80. Win XP cannot connect to WebDAV anymore.
I fiddled the requests - in Case 1 (working) the useragent is "Microsoft Data Access Internet Publishing Provider DAV" and in the 2nd (not working) it is "Microsoft-WebDAV-MiniRedir/5.1.2600".
I googled very much on that topic and found an article (from microsoft) where such a behavior is described, but no working solution provided.