Below are a few links I have used relating to Microsoft Azure Active Directory, including DirSync (aka Azure Active Directory Synch, aka Azure AD Connect)

1. Add in Multi-Factor Authentication (MFA) to Azure Active Directory
   • https://msdn.microsoft.com/library/azure/dn249466.aspx
2. Manage Azure AD
   • http://technet.microsoft.com/en-us/library/jj151815.aspx#BKMK_Requirements
3. Azure Active Directory Sync Services, Preview / Step by Step
   • http://kylgrn.com/2014/09/16/azure-active-directory-sync-services-preview-step-by-step/
4. DirSync: Using Alternate Login IDs with Azure Active Directory
   • http://social.technet.microsoft.com/wiki/contents/articles/24096.dirsync-using-alternate-login-ids-with-azure-active-directory.aspx?wa=wsignin1.0
5. Fix Duplicate DirSync Errors
   • http://support.microsoft.com/kb/2647098
6. Azure AD Connect: One simple, fast, lightweight tool to connect AD and Azure AD
   • http://blogs.technet.com/b/ad/archive/2014/12/15/azure-ad-connect-one-simple-fast-lightweight-tool-to-connect-active-directory-and-azure-active-directory.aspx