Issues with Mac accessing Windows share

We have a Server 2008 domain with mixed Lenovos and Mac clients.

A Mac user was trying to move a folder in the Public Share into another subfolder. Public share has Everyone - Full Control rights. He was prompted for  username and password -which is odd since none of the folders have ACLs. Even entering correct credentials (domain user or domain admin) would not work.

From a Lenovo laptop, I tried renaming the top level folder and gott an error - "file in use." Looking into File and Storage Explorer on the NAS, I saw the an XLS file was open by another Windows user. After closing the file, I was able to rename the folder, and a the Mac user was able to move the folders.

1) is this expected behavior on the windows side?

2) why is the Mac user prompted with username and password, instead of file/folder in use?
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Skyler KincaidNetwork/Systems EngineerCommented:
1) That is an expected behavior on the Windows side. If a file is in use inside of a folder and you try renaming it the rename will fail because the path of the file is in use by the excel program.

2) The Mac was probably getting the same error but because it is not a Windows computer it defaulted to asking for credentials with higher privileges.

If files are in use you will always get error messages when moving folders or renaming them.

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