Is there a way to verify a UNC path exists? For example a file share should be present for users to share files but occasionally it gets deleted. we'd like to know as soon as that happens so the probe would have to verify the existence of a path like \\sam\public$\path\to\filesharearea. Is there a probe or way to accomplish this?

There is an user-contributed Windows fileshare probe on our website. This command-line probe uses a Visual Basic script to test a Windows fileshare. I'm not sure if it will work for you, but it's worth a try:

Application monitoring probes