We have a new Windows 10 machine here, a Dell XPS13 we are setting up. When we get to adding a mapped drive for a network share, we are unable to access the share. It should open with everyone level access. All other workstations and laptops varying from XP, Ubuntu, Win7, Win8 Vista, etc have no trouble accessing this network share. We try the network name, try the ip. We try a variety of authenticated accounts on the computer. No combination of user/pass seems to work. We just get password incorrect messages. What the hell Windows 10?

We turned on the Guest account, which is off by default. That showed some resources across the network but did not resolve the issue with our file server.

We find the following article and follow the steps:
http://www.dedoimedo.com/computers/windows-10-network-share-access.html

Windows 10 it seems changed the default behavior to access some network resources as a guest. This was not a full resolution.

Then we find the following article and follow the instructions:
http://www.neowin.net/forum/topic/1261994-fix-windows-10-accessing-network-drives-password-incorrect/

After this, we map the drive and go back to disable the guest account and put the registry entry back again.

The full resolution is to enter the following on the username / password prompt when you try to access a network resource in Windows 10:
ComputerName\Username
Password

For example, for a drive with everyone permission, it would be:
FileServerName\Guest
blank

Just another daily time burn to find a resolution for this weird issue. Credit to warwagon on neowin.net.