Our products are affected by a lot of seasonal events like festivals and hence the software will go wrong and will give a lot of outliers.

The beauty of the advanced statistical methods like exponential smoothing is that it determines the seasonality extremely well as one of its components. Hence, an yearly festive event shall easily get detected and taken care of for its demand behavior. In case of shift in months like some of the Indian festivals, a good forecasting software like Planamind or Forecast Pro allows for marking events to adjust for the shift.