Office 365 Windows Azure Active Directory Sync tool - Version Release History You can check your DirSync version by running the following PowerShell command : (GP 'hklm:SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft Online Directory Sync').DisplayVersion The latest version can be downloaded here: Windows Azure Active Directory Sync tool – 64 bit http://social.technet.microsoft.com/wiki/contents/articles/18429.windows-azure-active-directory-sync-tool-version-release-history.aspx Configuring SMTP relay for Office365 / Exchange Online http://windows.ittips.eu/2014/04/configuring-smtp-relay-for-office365.html