As of earlier today, the try server began uploading windows debugging symbols to a symbol server. For those of you interested in debugging your Windows try server builds you can follow the same instructions listed on devmo replacing http://symbols.mozilla.org/firefox with http://build.mozilla.org/tryserver-symbols. (For posterity, this information is also recorded on the try server wiki page. Any problems discovered should be filed (as always) in Webtools:Try Server.