Если по теме, то Search-Mailbox.
Get-Mailbox -ResultSize Unlimited | Search-Mailbox -SearchQuery "kind:meetings AND Subject:'Test1' AND From:roger@contoso.com" -EstimateResultOnly Get-Mailbox -ResultSize Unlimited | Search-Mailbox -SearchQuery "kind:meetings AND Subject:'Test1' AND From:roger@contoso.com" -DeleteContent
Remove-CalendarEvents -Identity chris@contoso.com -CancelOrganizedMeetings -QueryWindowInDays 120 Remove-CalendarEvents -Identity "Angela Gruber" -CancelOrganizedMeetings -QueryStartDate 11-1-2018 -QueryWindowInDays 120 Remove-CalendarEvents -Identity "Jacob Berger" -CancelOrganizedMeetings -QueryStartDate 9-1-2018 -QueryWindowInDays 90 -PreviewOnly -Verbose
Set-Mailbox -Identity tony@contoso.com -CalendarRepairDisabled $true