I don't mind stewed truck stop tea (the pot is kept hot, then as it gets used, you add more hot water n tea bags, but never empty it)
But never, microwaved cold tea, that's just not cricket old boy!
Leaves or bag (my pref is Yorkshire tea bags)
Place bag in a mug, add sugar
Pour fresh (boiled once and.only once and use straight off the boil) boiled water over teabag, stir n leave for 2 mins or so
Squeeze teabag in the mug n bin
Add enough milk to discolour... NEVER ADD MILK FIRST, ALWAYS AFTER THE TEA HAS BREWED.