I have successfully used the Gnome Nautilus browser in the past to mount Windows as well as Microsoft DFS shares.
The File > Connect To Server > Windows Share and filling out the form should suffice for a normal server. For a DFS mount I normally go to Bookmarks > Edit bookmarks and add a short cut:
This should work fine. However recently I had issues with this on Ubuntu 12.10 64-bit. The Nautilus mount kept asking for the password. If you do have this issue you can try using the command line first:
~$ smbclient \\\\server1\\Docs -U rrosso -W domain <your_password>
~$ gvfs-mount smb://server1/Docs
If that does work for you but Nautilus does not you might need to add one or all of the following settings to /etc/samba/smb.conf:
# more /etc/samba/smb.conf ... [global] client use spnego = no client lanman auth = yes client ntlmv2 auth = no ...