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Below are two OLD articles users might like to read<br />
<br />
<a href="http://blogs.technet.com/b/chrisavis/archive/2013/04/24/active-directory-the-difference-between-on-premise-and-in-the-cloud.aspx" rel="ugc">http://blogs.technet.com/b/chrisavis/archive/2013/04/24/active-directory-the-difference-between-on-premise-and-in-the-cloud.aspx</a><br />
<br />
<a href="http://blogs.technet.com/b/chrisavis/archive/2013/04/26/active-directory-differences-between-on-premise-and-in-the-cloud-part-2.aspx" rel="ugc">http://blogs.technet.com/b/chrisavis/archive/2013/04/26/active-directory-differences-between-on-premise-and-in-the-cloud-part-2.aspx</a>
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Below are two OLD articles users might like to read

http://blogs.technet.com/b/chrisavis/archive/2013/04/24/active-directory-the-difference-between-on-premise-and-in-the-cloud.aspx [http://blogs.technet.com/b/chrisavis/archive/2013/04/24/active-directory-the-difference-between-on-premise-and-in-the-cloud.aspx]

http://blogs.technet.com/b/chrisavis/archive/2013/04/26/active-directory-differences-between-on-premise-and-in-the-cloud-part-2.aspx [http://blogs.technet.com/b/chrisavis/archive/2013/04/26/active-directory-differences-between-on-premise-and-in-the-cloud-part-2.aspx]

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I have two old on-premise Active Directory domain controllers that need upgrading.<br />
<br />
&nbsp;1. Can I actually put these 100% in the Azure Active Directory cloud ?<br />
&nbsp;2. If not, what features does Azure Active Directory cloud still not offer ?
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I have two old on-premise Active Directory domain controllers that need upgrading.

 1. Can I actually put these 100% in the Azure Active Directory cloud ?
 2. If not, what features does Azure Active Directory cloud still not offer ?

Active Directory -- Azure vs on-premise ?

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.