Exercise Entries

The calories you burn in your normal daily activities (non exercise ones) were taken into account by the MFP calculator when you set your "activity level" (sedentary, lightly active, etc.) - therefore if you enter your Microsoft Band calorie burn you might be counting them twice... I would set the MFP to the correct level of activity (you can judge that by the average of your Microsoft band overtime) and enter only the actual cardio calories. I would not rely too heavily on the accuracy of these measurements (which are highly unreliable). Several MFP users choose to only eat back part of their exercise calories to account for that inaccuracy.

Does Micrsoft Band link to MFP? If yes, then link the two of them, set your activity level to 'sedentary' and turn on negative calorie adjustments.

This is what I do with my Fitbit, and it will link to MFP causing MFP to add calories for extra activity or remove calories (this is the negative calorie adjustment) if I haven't reached the MFP activity level (you don't want this to happen much, which is why you go with the lowest option of sedentary).

Ah, that bites. Still, I would suggest setting MFP to sedentary if you are going to log your Microsoft Band activity. That way, you don't include activity that is already considered by MFP as part of your set activity level.

ETA: Basically I'm agreeing with what Eugenia said.