In pre-Data ONTAP 8.1 releases, users are allowed to create a CIFS share with a backslash "\" in the share path.
In Data ONTAP 8.1, the system validates paths during both share creation and processing the SMB2 requests.
Data ONTAP 8.1 allows only a forward slash "/" in the share path.
If you upgrade to Data ONTAP 8.1 from an earlier release, all the CIFS shares with "\" in the share path
are not accessible from SMB2 clients (Vista/Win7).