客户场景：为很多用户单独配置过邮箱配额，想重新规划，现需要导致所有用户实际容量清单
    实现方式：直接上代码

#加载Exchange命令
Add-PSSnapin Microsoft.ex*
#主命令
[array]$output = "" | Select Name,ProhibitSendQuota,DBName
$DBs = Get-MailboxDatabase | Select Name,ProhibitSendQuota
foreach ($DB in $DBs) {
[string]$DBQuota = $DB.ProhibitSendQuota
[string]$DBName = $DB.Name
Write-Host "Database $DBName's quota is $DBQuota"
$Mails = Get-Mailbox -Database $DBName | Select Name,ProhibitSendQuota
foreach ($Mail in $Mails) {
if ($Mail.ProhibitSendQuota -eq "Unlimited") {
[string]$MailQuota = $DBQuota
}
else {
[string]$MailQuota = $Mail.ProhibitSendQuota
}

$Temp = "" | Select Name,ProhibitSendQuota,DBName
$Temp.Name = $Mail.Name
$Temp.ProhibitSendQuota = $MailQuota
$Temp.DBName = $DBName
#$Temp

$output += $Temp

}
}
$output | Export-Csv MailQuota.csv -NoTypeInformation -Encoding UTF8
输出结果：

与预期对比：

结论：如果为用户配置了不限制容量，则不能正常获取（客户实际环境中仅为董事长有配置无限制，手动修正，符合客户需求），欢迎帮解决此bug

    Update:
    客户提出了几点疑问：
    1. 这个结果我无法看出哪些用户是有手动配置过的
    2. 我不知道用户使用了多少，用了多少空间
    3. 需要最后登录时间
    4. 我有很多Mail Server，如果我只想获取一台怎么办？
    5. 我在C盘打开的这个脚本，但这个脚本实际位置在D盘，这个输出文件输出到了C盘怎么办？需要输出到脚本所在的目录

针对以上，优化了脚本：

1. 先直接上脚本
   param($Server)
   $outfile = $(Split-Path -Parent $MyInvocation.MyCommand.Definition) + "\" + (Get-Date -UFormat "%Y-%m-%d_%H-%M-%S") + ".csv"
   Write-Host $outfile
   [array]$output = "" | Select Name,DBName,UserQuota,DBQuota,ProhibitSendQuota,TotalItemSize,Use,LastLogonTime
   #Select Name,DBName,UserQuota,DBQuota,ProhibitSendQuota,TotalItemSize,Use
   Add-PSSnapin Microsoft.ex
   if($Server){
   $DBs = Get-MailboxDatabase -Server $Server| Select Name,ProhibitSendQuota
   } else {
   $DBs = Get-MailboxDatabase | Select Name,ProhibitSendQuota
   }
   foreach ($DB in $DBs) {
   [string]$DBQuota = $DB.ProhibitSendQuota
   [string]$DBName = $DB.Name
   Write-Host "Database $DBName's quota is $DBQuota"
   $Mails = Get-Mailbox -Database $DBName -ResultSize unlimited | Select SamaccountName,ProhibitSendQuota
   foreach ($Mail in $Mails) {
   if ($Mail.ProhibitSendQuota -eq "Unlimited") {
   [string]$MailQuota = $DBQuota
   }
   else {
   [string]$MailQuota = $Mail.ProhibitSendQuota
   }
   $TotalItemSize = Get-MailboxStatistics -Identity $Mail.SamaccountName | select TotalItemSize,LastLogonTime
   $TempA = $Mail.ProhibitSendQuota
   $Temp = "" | Select Name,DBName,UserQuota,DBQuota,ProhibitSendQuota,TotalItemSize,Use,LastLogonTime
   $Temp.Name = $Mail.SamaccountName
   $Temp.DBName = $DBName
   if ($TempA -eq "Unlimited") {
   $Temp.UserQuota = $TempA
   } else {
   #$Temp.UserQuota = $TempA.replace(" ","").split("(")[0]
   $Temp.UserQuota = $($TempA -replace " ").Split("(")[0]
   }
   $Temp.DBquota = $($DBQuota -replace " ").Split("(")[0]
   $Temp.ProhibitSendQuota = $($MailQuota -replace " ").Split("(")[0]
   $Temp.TotalItemSize = $($TotalItemSize.TotalItemSize -replace " ").Split("(")[0]
   $Temp.Use = ('{0:n2}' -f $($Temp.TotalItemSize / $Temp.ProhibitSendQuota 100)) +'%'
   $Temp.LastLogonTime = $TotalItemSize.LastLogonTime
   #$Temp

$output += $Temp

}
}
#$output[1..$output.count]
$output[1..$output.count] | Export-Csv $outfile -NoTypeInformation -Encoding UTF8 -Force

2. 输出结果
   
3. 脚本执扫方式
   a. 直接执行则获取所有用户
   b. .\xxx.ps1 -Server XX则获取指定Server上的DB

欢迎补充