I have converted my domain "domain.com" to 2000 AD,we have 2 DC's DC1 and DC4 ( both win2000) and a NT 4.0 BDC ,that seems to have gone fine, but when I go to my file server (windows 2000 server not Domain Controller)and look at the security of folders, some users show up as SID numbers not the username???? any ideas?