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          Gets and sets the current message index for the current storage
          file. Syntax
          object.StoreIndex [= value ] Remarks
          The StoreIndex property returns the current message index
          for the message store. Setting this property changes the current
          message index. When no storage file has been opened, this property
          will return a value of zero. After a storage file has been opened, it
          is changed to a value of one, the first message in the message store.
          The maximum value for this property is the number of messages in the
          store, as returned by the StoreSize property. Attempting to
          set this property to a value less than one or greater than the number
          of messages in the store will result in an exception being
          thrown. This property value is updated whenever the ReadStore or
          ReplaceMessage methods are used. When the WriteStore
          method is used to store the current message in the message store,
          this property will be updated to reflect the message index of the
          newly added message. Data Type
          Integer (Int32) See Also
          StoreCount Property,
          StoreFile Property,
          StoreSize Property,
          FindMessage Method,
          ReadStore Method,
          WriteStore Method
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