Windows Hello for Business

In Windows 10, Windows Hello for Business replaces passwords with strong two-factor authentication on PCs and mobile devices. This authentication consists of a new type of user credential that is tied to a device and uses a biometric or PIN.

Windows Hello for Business lets user authenticate to an Active Directory or Azure Active Directory account.

if you have only office 365 subscription and windows 10 then also your user able to login through windows hello no need local AD.

Windows Hello addresses the following problems with passwords:

• Strong passwords can be difficult to remember, and users often reuse passwords on multiple sites.
• Server breaches can expose symmetric network credentials (passwords).
• Passwords are subject to replay attacks.
• Users can inadvertently expose their passwords due to phishing attacks.

Overview of Exchange Database Concepts and Architecture.

The mailbox database is the primary component in Exchange Server 2016. Unlike previous Exchange Server versions, which also contained public folder databases, Exchange Server 2016 works only with mailbox databases.

Mailbox databases contain data, data definitions, indexes, checksums, flags, and other information that constitute mailboxes in Exchange Server 2016. Mailbox databases hold individual users’ private data, and also contain the mailbox folders that Exchange Server generates when you create mailboxes for those users. You can host the mailbox database on a single server, or you can distribute it across multiple mailbox servers if you have deployed database availability groups (DAGs).

Exchange Server 2016 stores the mailbox database in a database file, also known as an Exchange database (.edb) file. In addition to the .edb file, Exchange Server 2016 uses a set of data files to host and maintain the mailbox database. These files include: