#Подключаемся к вашему серверу Exchange
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri http://имя сервера/PowerShell/ -Authentication Kerberos
Import-PSSession $Session
#Дата 2 года назад (24 месяца)
$D2Year = (Get-Date).AddMonths(-24)
$Date2Year = Get-Date $D2Year -f "d"
$resourceGroup = "All Resource Room" #Группа со всеми переговорками
$resourceRoom = (Get-ADGroupMember -Identity $resourceGroup -Recursive | Select samaccountname).samaccountname
foreach ($r in $resourceRoom) {
Search-Mailbox -identity $r -SearchQuery "Received:01/01/2001..$Date2Year kind:meetings" -DeleteContent -Force
}