Ok.. I'm confused now.. .
TR-4067 - Clustered Data ONTAP - NFS Best Practice and Implementation Guide
Section 4.4 NFS on Windows
It is possible to use NFS with clustered Data ONTAP systems on Windows operating systems either by
installing the native Windows NFS tools (such as Services for NFS in Windows 2008 and later) or by
third-party tools, such as Hummingbird/OpenText NFS client, Cygwin, and so on. However, locking with
NFSv3 is not currently supported in clustered Data ONTAP. To use NFS on Windows, either use NFSv4.x
or disable the NLM portion of the NFS client.
Use of NFSv4.x will require interaction with an LDAP server for ID to name mapping, as well as a valid
NFSv4 ID domain.
PCNFS, WebNFS, and HCLNFS are not supported with clustered Data ONTAP storage systems.
So does that mean "it is possible to use NFS" on windows.. but it is not supported?
I haven't been able to confirm this, but I think NFSv4 is only available in win2012, the earlier releases only supported NFSv3.
Other than that.. I haven't been able to find anything on "disable NLM portion of the NFS client" yet.