Our lemon tree was purchased in May. We had it outdoors we have lemons and now that the plant is indoors near a window it is dropping its leaves. Is this good? What should we be doing?
Help thankyou.

The transition from higher outdoor light and higher humidity to lower indoor light and lower humidity can cause some indoor plants that are placed outside to lose leaves, sometimes lots of them when brought inside in the fall.
Give it time to adjust and it should slow down on the leaf drop then eventually stop shedding, it may look a little bare for a while though.
Keep your citrus in a window that gets some sun and let the soil get pretty close to dry before re-watering. You don't want to over-water with less leaves now.
You should see some new growth with the right care and a little patience. Don''t feed until you see lots of new growth in the spring/summer months. You might have to do some pruning then as well.
Next year, if you have it outside again, move it to higher and more direct light gradually so the leaves don't burn, then, come late Oct or so, move it gradually into less and less direct sunlight before moving it inside the house, doing this should keep all leaves from falling like they did with such a quick and drastic light change.