Office 365 Sign in page branding

Today we are adding two Identity and Access Management features to the Office 365 subscription, which were previously only available with an additional Azure Active Directory (AD) Basic, Azure Active Directory (AD) Premium, or Enterprise Mobility Suite subscription. The new features are the Sign in page and Access Panel company branding and cloud user self-service password reset. These two new features are beginning to roll out for Office 365 customers starting today.

Simple sign up for Azure AD > got to AD> configuring > Branding