我声明了以下代码和变量。当扩展到下面的邮箱创建 cmdlet 时，如何确保 $shared_mailbox_alias 变为小写？由于它基于以大写字母输入的 $Project_code：

$Project_number = Read-Host -Prompt 'What is the Project Number ie. 02XXX'
$Project_code = Read-Host -Prompt 'What is the Project Code (in capital letters) ie. CRE'
$Project_name = Read-Host -Prompt 'What is the Project extended Name ie. Victoria Station Platform'

$shared_mailbox_displayname = "File: $Project_name"
$shared_mailbox_name = "$Project_code"
$shared_mailbox_alias = "file.$Project_code"

New-Mailbox -Shared -DisplayName $shared_mailbox_displayname -Name $shared_mailbox_name -Alias $shared_mailbox_alias -PrimarySmtpAddress $shared_mailbox_primarysmtp

我的目标是拥有“file.abc”而不是“file.ABC”的别名，并且我无法更改它作为输入 (ABC) 给出的方式，因为我有其他 cmdlet 使用该语法创建文件夹.

干杯