Microsoft TS:Windows Internals is an official exam run by Microsoft under exam code 070-660. Passing it awards the Microsoft Certified Technology Specialist (MCTS): Windows Internals certification, which sits at the Specialist tier. Certified professionals remain in shorter supply than the market wants, which is precisely why this exam keeps showing up in conversations about better roles and better pay.

The Microsoft TS:Windows Internals exam gives you 120 minutes to work through 45–68 questions. That is a tight ratio, and it punishes candidates who get emotionally attached to any single item. The fix is mechanical: answer what you know, flag what you do not, and keep moving. A few full-length timed runs in the Actual4Exams test engine, with its randomized question order, will calibrate your pace far better than untimed reading ever could.

The official fee for Microsoft TS:Windows Internals is Retired, historical price ~$125–$150 USD, and 700 (scale 1–1000) is what passing takes. The uncomfortable part: retakes cost the full Retired, historical price ~$125–$150 USD again, which makes preparation the cheapest line item in this whole project. Before booking, put yourself through repeated scored sessions with the Actual4Exams practice tests and compare results over time; a stable margin above the passing line, not a single lucky run, is when you are ready.

No formal prerequisites; recommended deep Windows OS knowledge

Vendor rules do get revised, so treat this as your starting point and confirm the current eligibility details before booking via the official exam page.

Microsoft TS:Windows Internals registration runs through these official channels.

• Prometric (historical)

Worth noting when you schedule: the exam is delivered Proctored onsite at Prometric test centers; retired.

Yes, Microsoft points Microsoft TS:Windows Internals candidates toward the following training.

• Windows Internals Book (Mark Russinovich et al.)

Whatever course you choose, close the loop with question practice: the 68 items in the Actual4Exams 070-660 package convert course knowledge into exam-day scoring ability.

It is. Actual4Exams publishes a free PDF demo of the Microsoft TS:Windows Internals material, so the product can prove itself before you pay. Your purchase then comes with 365 days of free updates, and once that period ends, extending the update service costs 50% of the regular price. The test engine software itself is verified malware-free and safe to install.

Actual4Exams stands behind the product with a 100% money-back guarantee under defined conditions. If you take the Microsoft TS:Windows Internals exam within 60 days of purchase and fail, you qualify for a full refund, provided the exam corresponds to your product. Sitting the exam within 3 days of purchase does not qualify, and neither do unused downloads, free materials, or expired orders; the candidate name must match the payer name. Submit a scanned enrollment slip and the official Score Report PDF within 2 days of the exam, and claims are resolved within 7 days. You may also choose an exchange instead of a refund: two other exam products of equal value, free, with the update service on your original purchase retained.

Delivery takes about a minute. Files unlock for instant download at payment and are emailed to you automatically; if 2 hours pass with nothing received, check spam and contact customer service. There is no installation limit, so the test engine can live on every device you own, phone included.

Microsoft TS:Windows Internals breaks down into 5 official domains, led by I/O System and Storage (20%), Debugging and Troubleshooting (20%), and System Mechanisms (20%). You will find the full topic-by-topic outline above on this page; use the weightings to budget your study hours where they pay back the most.