Use the Remove-AddressList cmdlet to remove existing address lists.
> Remove-AddressList -Identity “AddressList1” -Recursive
This example removes the address list named AddressList1 and all of its child address lists.
> Remove-AddressList -Identity “AddressList1”
This example removes the address list named AddressList1 (the child address list within AddressList 1 must be removed before this cmdlet is executed)
2) Update Address List
Unfortunately, new address lists aren’t automatically updated in Exchange Online.
