When trying to copy files from the OS X 10.5 (also happens in OS X 10.3 and OS X 10.4) to Windows Server 2003 you get the following error:
‘you cannot copy some of these items to the destination because their names are too long or contain invalid characters for the destination. Do you want to skip copying these items and continue copying the other items?’
On the 2003 Server:
Go to Security Settings, Local Policies, security Options.
Disable the following:
Domain member: Digitaly encrypt or sign secure Channel Data(Always)
Microsoft network server: Digitally sign communications (always)
Microsoft network server: Digitally sign communications (if client agrees)
Make sure that the Macs are mounting the network drive with SMB rather than AFP (this caught me out for a while). I don’t know how to fix the error with AFP however samba is good enough to use in 10.5.