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Returns the total number of rows in the table.
Use GetRowCount to find out how many rows a table holds before making a call to the IMAPITable::QueryRows method to retrieve the data. If there are less than twenty rows in the table, it is safe to call QueryPosition to retrieve the whole table. If there are more than twenty rows in the table, consider making multiple calls to QueryPosition and limit the number of rows retrieved in each call.
Some tables do not support GetRowCount and return MAPI_E_NO_SUPPORT. If GetRowCount is not supported, an alternative might be to call IMAPITable::QueryPosition. With the results from QueryPosition, you can determine the relationship between the current row and last row.
When GetRowCount returns MAPI_E_BUSY because it is temporarily unable to retrieve a row count, call the IMAPITable::WaitForCompletion method. When WaitForCompletion returns, retry the call to GetRowCount. Another way to detect whether an asynchronous operation is in progress is to call the IMAPITable::GetStatus method and check the contents of the lpulTableState parameter.