为O365设置不可变ID的脚本

# 连接到Exchange Online PowerShell
$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session

# 设置不可变ID
$User = Get-Mailbox -Identity "user@example.com"
$ImmutableID = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($User.UserPrincipalName))
Set-MsolUser -UserPrincipalName $User.UserPrincipalName -ImmutableId $ImmutableID

# 断开与Exchange Online PowerShell的连接
Remove-PSSession $Session