(First asked at http://answers.microsoft.com/en-us/windows/forum/windows_tp-security/using-microsoft-account-on-domain-joined-windows/63093b15-af76-4461-a23e-8f8b739f4960, was told to come here...)
I have in-place upgraded a domain-joined Windows 7 machine to Windows 10 Technical Preview build 9860.
I can log on as before using my domain account, but I'd also like to be able to log on using my (personal) Microsoft account.
I tried typing firstname.lastname@example.org in the "user" box but this didn't work.
Any clue? Maybe the only way is to first create a local account and then associate it with the MSA but IMVHO this shouldn't be necessary...