I have two DNS321s and a DNS323 on a small local network, with a Windows XP computer and a Windows 7 computer. I've tried to set them all the same way.
I can access all the data on Windows 7, but there are some differences. The DNS321s show in My Computer as drives, with a bar showing how much space is used. The DNS323 shows as a file folder.
In Network, the 321s show as computers and will open and show data, and the 323 shows as Storage and clicking it goes to the 323 settings page.