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dsadd ou "OU=HAB,DC=1ask2,DC=com"
dsadd ou "OU=Corporate,OU=HAB,DC=1ask2,DC=com"
dsadd ou "OU=Human,OU=HAB,DC=1ask2,DC=com"

New-DistributionGroup -Name "1ask2,Ltd" -DisplayName "1ask2,Ltd" -Alias "1ask2Root" -OrganizationalUnit "1ask2.com/HAB" -SamAccountName "1ask2Root" -Type "Distribution"
Set-OrganizationConfig -HierarchicalAddressBookRoot "1ask2,Ltd"
New-DistributionGroup -Name "Corporate Office" -DisplayName "Corporate Office" -Alias "CorporateOffice" -OrganizationalUnit "1ask2.com/HAB" -SamAccountName "CorporateOffice" -Type "Distribution"
New-DistributionGroup -Name "Human Resources" -DisplayName "Human Resources" -Alias "HumanResources" -OrganizationalUnit "1ask2.com/HAB" -SamAccountName "HumanResources" -Type "Distribution"

Set-Group -Identity "1ask2,Ltd" -IsHierarchicalGroup $true
Set-Group -Identity "CorporateOffice" -IsHierarchicalGroup $true
Set-Group -Identity "HumanResources" -IsHierarchicalGroup $true


Add-DistributionGroupMember -Identity "1ask2Root" -Member "CorporateOffice"
Add-DistributionGroupMember -Identity "1ask2Root" -Member "HumanResources"

SeniorityIndex, the upper one has a higher index number.

Set-Group -Identity "HumanResources" -SeniorityIndex 100
Set-Group -Identity "CorporateOffice" -SeniorityIndex 200

Creating Users in AD:

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Mail-enable all of them

Add-DistributionGroupMember -Identity "CorporateOffice" -Member "James"
Add-DistributionGroupMember -Identity "CorporateOffice" -Member "Tonny"
Add-DistributionGroupMember -Identity "CorporateOffice" -Member "Peter"
Add-DistributionGroupMember -Identity "HumanResources" -Member "Simon"
Add-DistributionGroupMember -Identity "HumanResources" -Member "Jeff"
Add-DistributionGroupMember -Identity "HumanResources" -Member "Albert"
Add-DistributionGroupMember -Identity "HumanResources" -Member "Diana"
 
Set-User -Identity "James@1ask2.com" -SeniorityIndex 20
Set-User -Identity "Tonny@1ask2.com" -SeniorityIndex 10
Set-User -Identity "Peter@1ask2.com" -SeniorityIndex 30

ADSIEDIT.msc
ms-Exch-HAB-Root-Department-Link
isMemberOfPartialAttributeSet --True
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Restart King, FW, Queen, and EX2

Outlook:
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