Things like these are
always scams.
If this proves to be true, your account can and will be disabled.
If you ignore this mail your account can and will be closed permanently. Once we verify your account,
we will reply to your e-mail informing you that we have dropped the investigation.
We ask you to NOT change password until the investigation is fully completed.
"Can and will be" is the most retarded attempt at seriousness I've ever seen. If it can, it does not follow that it will. And if it will, there's no need to point out that it can.
And yeah, "please don't change your password until we are done stealing your account".