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Create an input file name contacts1.csv with the following attributes and values

Open the Exchange management shell and run the below cmd after copying all contacts to the path of shell

Import-Csv “contacts1.csv” | ForEach {New-MailContact -Name $_.Name -Firstname $_.FirstName -LastName $_.LastName -ExternalEmailAddress $_.ExternalEmailAddress -OrganizationalUnit “Domainname/OUname”}