The best windows copy utility – robocopy
Need to merge two files and keep only newer files?
robocopy c:\folder1 c:\folder2 /E /XO
Copy files between two servers and maintain permissions
robocopy c:\folder1 \\server\sharename\destination /E /sec
Robocopy is sweet because you can use it to sync folders, copy permissions, copy encrypted files, pretty much every file copy operation you can think of. Just do a robocopy /? at a command prompt to check it all out