In Vincent Maraia’s The Build Master (recommended) there’s a helpful little chart on the size in lines of code for Windows NT:
| Ship Date | Product | Dev Team Size | Test Team Size | Lines of code (LoC) |
| Jul-93 | NT 1.0 (released as 3.1) | 200 | 140 | 4-5 million |
| Sep-94 | NT 2.0 (released as 3.5) | 300 | 230 | 7-8 million |
| May-95 | NT 3.0 (released as 3.51) | 450 | 325 | 9-10 million |
| Jul-96 | NT 4.0 (released as 4.0) | 800 | 700 | 11-12 million |
| Dec-99 | NT 5.0 (Windows 2000) | 1,400 | 1,700 | 29+ million |
| Oct-01 | NT 5.1 (Windows XP) | 1,800 | 2,200 | 40 million |
| Apr-03 | NT 5.2 (Windows Server 2003) | 2,000 | 2,400 | 50 million |