Just one simple advise: sell software as if it were hardware. If you have it in store, you sell it, as it is. If you don't have it in store, you don't sell it.

Just one simple advise: sell software as if it were hardware. If you have it in store, you sell it, as it is. If you don't have it in store, you don't sell it. You can inform potential customers about next foreseen delivery, but do not act as if you _knew_ next delivery date. Just realise how absurd it is to plan a fixed time for tests: either it works, and the tests will run smoothly the first time, or it doesn't work, and you can't know when it will work. If you knew when it will work, than you'd have understood which defects it has, which means that you'd have had it right on the first time.