I was getting this error on my 2 CAS/HT Servers running Exchange 2010 SP2 RU4v2.
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Watson report about to be sent for process id: 10784, with parameters: E12, c-RTL-AMD64, 14.03.0123.004, WS, M.Exchange.StoreProvider, M.M.MapiMessage.CreateAttach, M.E.D.Storage.AccessDeniedException-27121, ffcb-5111, 14.03.0123.002. ErrorReportingEnabled: True
I was suggested by few board members here to uprgade to RU6 or SP3. So I did upgrade to SP3 about 2 days ago on one of my CAS/HT servers but today I see this above message again.
any ideas - thank you