Ok, I should search first and then ask.

The password for ALL VMs is always "Password1" !

Source : http://www.microsoft.com/download/en/details.aspx?id=11575#overview

It seems the password has changed to "Passw0rd!"

source: http://virtualization.modern.ie/vhd/virtualmachine_instructions.pdf?v=1.1

I just discovered this myself last night! I will update the docs.

Neither of these are working for me in the Windows XP VM.

Me too, not working when I try to run notepad as an administrator(to edit the hosts file).

@axebox @schikulski according to the link I mentioned earlier (haven't tested it myself):

Instructions to set password for XP VMs:

1. Using virtualization platform of choice, load the XP VM
2. Go to Control Panel | User Accounts
3. Select IEUser
4. Select "Create a password" link and enter the desired password

The default password is stored in the VM release notes:

• Visit https://www.modern.ie/en-us/virtualization-tools
• Select a VM from the first dropdown
• Select any platform from the second dropdown
• Scroll down the new page to see "instructions" linked to a PDF.
• The password is in that document (Ctrl+F it for "password")

As of April 29, 2015, the current document it links to is: https://modernievirt.blob.core.windows.net/vhd/release_notes_license_terms_1_5_15.pdf

None of these passwords work anymore. The logon screen even says "Password hint: Passw0rd", but typing Passw0rd repeatedly says "incorrect username or password". I tried various cases to make sure I wasn't fat-fingering it, but so far, it seems you're locked out of all of these VMs, for both the IEUser and Administrator accounts. The auto-login function at boot is the only way to get it.

@chrisspen the password is "Passw0rd!" (without the quotes, but with the ! )

The documentation is not useful. It doesn't tell you a password it tells you you need to create one. But to create a password YOU HAVE TO be logged in. What happens if you restart your VM? I'm locked out and have to delete and destroy the entire VM and start from scratch because there's no password documented in the readme file. Not sure why it can't be documented in the readme file directly.