Hi Fsck,
I have not gone to the school with the iMac, however I did some experiment in test environment.
I did do what you said but it did not make any difference.
My test environment,
WIndows 2008, Domain; home.local
Mac OS X 10.7.4
.I have joined to the domain, but simply using Join in Users and Groups using Server-2008.home.local
.I made sure the NetBios name and Computer name is the same
.I also included the server IP as WINS server
.Also added server IP in search domains( in the same windows where WINS is defined)
I logged out, still no Other option to logon with network account.
However I restarted the Mac and although at logon screen only local users were available to logon initially, after waiting for 30seconds, the Other option appeared.
This happened in several reboot; always Other appeared and I could logon.
However; Not sure if Mac somehow saves password of the logged on user somewhere( cannot be in keychain).
SInce after changing the password, or perhaps if there are similarities in IDs( local and network), it might get confused.
It