remove a meeting from (#exchange)

Write-Progress -Activity “Preparing” -Status “Retrieving mailbox list” -PercentComplete 0

$rooms=get-mailbox  -resultsize unlimited -warningaction:silentlycontinue| where {$_.name -notlike “*test*”}

$count=$rooms.count

foreach($room in $rooms)

{

$i=$i+1

$percentage=$i/$count*100

Write-Progress -Activity “Collecting mailbox details” -Status “Processing mailbox $i of $Count – $room” -PercentComplete $percentage

$room | search-mailbox -searchquery “kind:calendar from:tcox” -deletecontent -force

}

more details from TechNet
https://blogs.technet.microsoft.com/exchange/2010/10/27/removing-specific-messages-from-your-exchange-server/

note: credit goes to Mr R. very good PS scripts.