How to set msExchMailboxGuid with Set-ADUser command

Hi all,

I get users information (PrimarySMTPAddress,Alias,SamAccountName,FirstName,LastName,DisplayName,Name,ExchangeGuid,ArchiveGuid,LegacyExchangeDn,EmailAddresses) by Get-Mailbox command

Then export them to XML file (Export-Clixml) or CSV file (Export-Csv) .

How do I use Set-ADUser command to set msExchMailboxGuid property for user ?

$NewUsersList = Import-CSV "aduser.csv"
#Or
$NewUsersList = Import-Clixml "aduser.xml"
ForEach ($User in $NewUsersList) {
New-ADUser...
Set-ADUser -Identity $User.SamAccountName -Replace @{msExchMailboxGuid=$User.
msExchMailboxGuid # get error Set-ADUser : A value for the attribute was not in the acceptable range of values
}