Powershell LDAP query to find Azure / O365 users synchronised with AD Sync

Recently I needed to create a quick report that would allow me to see at a glance which accounts in that domain had been synchronised with AD Sync into Azure AD.  It wasn’t possible using Get-ADuser and I knew an LDAP query would do the trick.  First I had to download a powershell module called System.DirectoryServices.Protocols.  Once the module is downloaded run:

[cc lang="powershell"]Add-Type -AssemblyName System.DirectoryServices.Protocols
Import-Module C:\Cloudwyse\Tools\S.DS.P.psm1[/cc]

Then to query the information I required I ran:

[cc lang="powershell"]$MigratedUsers=Find-LdapObject -SearchFilter:"(msDS-ExternalDirectoryObjectId=*)" -SearchBase:"DC=contoso,DC=com" -LdapConnection:"server01.contoso.com" -PageSize 500[/cc]

Conversely, if you wanted to find all users that HADN’T been synchronised you could run the following:

[cc lang="powershell"]$MigratedUsers=Find-LdapObject -SearchFilter:"(!msDS-ExternalDirectoryObjectId=*)" -SearchBase:"DC=contoso,DC=com" -LdapConnection:"server01.contoso.com" -PageSize 500[/cc]

I still had a few service accounts showing so I just filtered these in Excel based on the DN.  To export the file just run…

[cc lang="powershell"]Export-CSV C:\Cloudwyse\User_report.csv[/cc]