Error 0x80040D74

Value: -2147218060 | 0x80040D74 | 2147749236

What does it mean ?

GTHR_E_RECOVERABLE_EXOLEDB_ERROR  
Read access to the Exchange store is temporarily unavailable. If this message persists, restart the Exchange store.
Value: 3444 | 0x0D74 | 0b0000110101110100

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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