We had an issue after installing RU8 for the exchange 2010 SP3. Some users reported receiving NDR from the server when they tried to send emails. Also on Exchange server we noticed event ID: 4999 from MSExchange Common process in Application Log Watson report about to be sent for process id: 600, with parameters: E12, c-RTL-AMD64, 14.03.0224.001, M.E.RpcClientAccess.Service, M.E.RpcClientAccess.Handler, M.E.R.H.ViewCache.IsRowWithinUnreadCache, System.IndexOutOfRangeException, 8e38, 14.03.0224.001. ErrorReportingEnabled: False
We learn not long after that MS recalled the RU8 update due to the major bug in it. FIY you will need to copy of the SP3 handy in order to rollback the update.
