Convert-AadMigrationEligibleDistributionGroups.ps1

# Usage:
# Edit default OU path if you aren't going to specify it on the command line (you normally won't).
# (If pasted into a script file, dot source it to bring functions into current scope)
# Connect to your EXO instance:
# & "C:\Program Files\Internet Explorer\iexplore.exe" https://cmdletpswmodule.blob.core.windows.net/exopsmodule/Microsoft.Online.CSE.PSModule.Client.application

# To list eligible groups:
# Get-AadMigrationEligibleDistributionGroups 

# To Select some group\groups:
#  Get-AadMigrationEligibleDistributionGroups | ogv -PassThru | Convert-AadMigrationEligibleDistributionGroups

# To migrate all groups: 
# Get-AadMigrationEligibleDistributionGroups | Convert-AadMigrationEligibleDistributionGroups


function Get-AadMigrationEligibleDistributionGroups
{
    [cmdletbinding()]
    Param(
    $Filter = "*"
    )
    
    $AADGroups = Get-DistributionGroup -Filter $Filter
    $AADGroups | ? {!$_.IsDirSynced}
}

function Convert-AadMigrationEligibleDistributionGroups
{
    [cmdletbinding()]
    Param(
    [Parameter(
    Position=0, 
    ValueFromPipeline=$true)
    ]
    [Alias('AzureADGroup')]
    $AadGroup,
    [switch]$WhatIf,
    [string]$NewGroupPath = "OU=Users,DC=example,DC=com"
    )
    begin {
        $ErrorActionPreference = "Stop"
    }
    
    
    process {
        foreach($GroupToMigrate in $AadGroup)
        {
            $GroupMembers = Get-DistributionGroupMember $GroupToMigrate.Identity | select -Expand Name | 
            Foreach-Object {@(get-aduser -Filter "Name -eq '$_'")[0].SamAccountName}
            New-ADGroup -Path $NewGroupPath -Name $GroupToMigrate.Name -GroupCategory Security -GroupScope Universal -WhatIf:$WhatIf -OtherAttributes @{
                ProxyAddresses=($GroupToMigrate.EmailAddresses -join ";");
                Mail=$GroupToMigrate.PrimarySmtpAddress;
                msExchHideFromAddressLists=$GroupToMigrate.HiddenFromAddressListsEnabled;
                msExchRequireAuthToSendTo=$GroupToMigrate.RequireSenderAuthenticationEnabled;
                DisplayName=$GroupToMigrate.DisplayName;
            }
            Add-ADGroupMember -Identity $GroupToMigrate.Identity -Members $GroupMembers
        }
    }
    
    end {}
    
}