I want to use the ADMT tool for migrating users and
groups to Win2k. When I start the wizard, I want to test
and migrate later option. It tells me that the Win2K
server is not in native mode.

Q1. After would perform a user migration from NT, would
those user accounts in NT still exist on the NT Server?

Q2. If I change to Native mode on the Win2k box, (new
domain on same physical network as old domain) will this
affect my current working domain's functionality?