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I have Windows 7 64-bit, I don't see any issue mapping to a DNS-323 or a DNS-321. FWIW, I've never used Easy Search, don't even know what it looks like. The standard Windows networking works just fine with the DNS-323.
My experience with Win7-64 bit is that my Windows 7 login name and password must be identical to my DSN-323 username and password. Then all shares on the DNS-323 are reconnected at Win-7 login.I have tried everything possible in Win-7 I know of to set up a drive reconnect when the id and/or password on the DNS are different. I always get a user/password prompt when attempting to access the shares for the first time. I'm on 1.06 firmware. Haven't tried anything newer.