Written by Thomas Speekenbrink
A behaviour we have seen in the past is the SyncUser sending out many emails. This is a setting on Exchange and can be solved by following this KB article.
How to disable in Exchange 2007:
Execute this Exchange Powershell command: Set-MailboxCalendarSettings –Identity “SyncUser”-RemoveForwardedMeetingNotifications $True
How to disable in Exchange 2010:
Execute this Exchange Powershell command: Set-CalendarProcessing –Identity “Sync User” – RemoveForwardedMeetingNotifications $True