Gmail is pretty generous with the amount of space they give you. If you have a free account, you get 10 gigabytes. When you upgrade to one of their plans, this limit is pushed up to 25 gigabytes. You’d have to be the type who archives everything in order to reach the limit, because it seems highly unlikely that you ever will. But hey, it could happen–and if you think you’re bordering on full email capacity, then you need FreeSpace.