Microsoft Natural Ergonomic Keyboard 4000: 12 Years and a Broken Wrist

I bought the Microsoft Natural Ergonomic Keyboard 4000 in 2014, after a motorcycle accident broke my wrist. It was the right keyboard for that moment in my life. I used it every day for nine years. I switched to a different keyboard three years ago. Here’s the honest take on a classic, dated, expensive, and very large ergonomic keyboard that did its job and earned its retirement.

What it is

The Microsoft Natural Ergonomic Keyboard 4000 is a wired, full-size, split ergonomic keyboard with a cushioned palm rest and a curved key layout. It is gray and black, plastic, and roughly the size of a forearm. The key feature is the split: the keys are arranged in a wavy, two-zone layout that follows the natural angle of your wrists, with a soft palm rest at the bottom for the heels of your hands. There is also a side-mounted zoom slider on the left edge that scrolls horizontally — a Microsoft Office power-user feature that almost nobody in 2026 actually uses.

The keyboard is from 2005. Microsoft has not refreshed the design in a meaningful way in twenty years. The current retail price is around $140 to $160, which is more than most mechanical keyboards and about three times what the K619 Horus cost me. It is no longer the most ergonomic keyboard on the market. It is one of the few wired ergonomic keyboards that still has a track record of lasting a decade.

Living with it

When I bought this keyboard, I had a broken wrist. A standard straight keyboard was painful to type on for more than a few minutes at a time. The Microsoft Natural’s split layout, with the key wells angled to follow the natural wrist position, was the only thing that let me work a full day at a desk. I kept it at a normal desk position — no tenting, no negative tilt, no split-key tricks — and the keyboard did the work of accommodating my wrist for nine years.

The keyboard is huge. The cushioned palm rest is the same width as the keys themselves, and the split layout means the keys are not on a tight grid — they spread out to the sides, which is exactly what makes them ergonomic but also what makes the keyboard physically enormous. If your desk is shallow, the keyboard will reach almost to the edge.

The keys are quiet, low-travel, membrane-style switches. The keyboard has no RGB and no backlight — no way to use this in a dark room without a desk lamp. I used the volume keys daily. I never used the zoom slider. I never used the customizable hot keys. I never installed any Microsoft software. The keyboard worked fine without it, which is exactly what I wanted from a keyboard in 2014 and is exactly what I still want from a keyboard in 2026.

After nine years, the keyboard still worked. The plastic was scuffed. The wrist rest was darkened where my hands rested. The split layout still did its job. The reason I switched to the Redragon K619 was that I no longer needed the ergonomic layout — my wrist had healed enough that a straight keyboard was comfortable again, and I wanted a smaller footprint and some color on the desk. The Microsoft Natural was retired not because it failed, but because I no longer needed what it did. That is the highest compliment I can give a piece of hardware I bought for $90 in 2014.

What I like

• The split layout actually works. When you have a wrist injury or a long day of typing in front of you, the split key wells reduce strain in a way that no straight keyboard can match. That is the whole point of this keyboard, and it delivers.
• It lasted nine years of daily use. No software, no firmware updates, no maintenance, no failures. The hardware did what it was supposed to do, every day, for nearly a decade.
• No software, no drivers, no nonsense. Plug in the USB cable and it works. The hot keys do the default things. The volume keys do volume. The keyboard never asked me to install anything.
• The cushioned palm rest. Looks like an afterthought, but it isn’t. Heel-of-hand support is the difference between typing for an hour and typing for a day on a wrist that doesn’t want to type.
• Quiet, low-travel keys. Not mechanical, but not loud. The keyboard has a soft membrane feel that I never minded.

What annoys me

• It is enormous. A full-size split ergonomic keyboard with a palm rest is a forearm’s worth of desk space. On a shallow desk the keyboard reaches the front edge. On a deep desk it makes a smaller monitor feel small by comparison.
• It is expensive for what it is now. $140 to $160 in 2026 for a twenty-year-old design that uses membrane keys, has no backlight, and is missing every modern feature. A used Microsoft Sculpt on eBay is half that.
• No backlight. The keyboard has no way to be used in a dark room. If you work late or in low light, you need a desk lamp aimed at the keys.
• The zoom slider is a 2005 feature. Microsoft Office power users loved it. The rest of us never touched it. It is a physical object taking up the left edge of the keyboard that does nothing for most modern workflows.

Who it’s for, who should skip

Buy it if you have a wrist injury, a chronic wrist condition, or a job that has you typing eight hours a day on a standard straight keyboard and you can feel the strain. The split layout is the real reason to buy this keyboard, and it is the reason Microsoft kept selling it for twenty years. It works for the use case it was designed for. If you need ergonomic relief and you want a wired, no-fuss, well-known product, the 4000 will do the job.

Skip it if your wrists are healthy. The split layout that fixes a problem for one person is just a giant keyboard for another. Skip it if you want mechanical keys, RGB, or any modern feature. Skip it if your desk is small. Skip it at the current $140 to $160 retail unless you specifically need what it does. A used Microsoft Sculpt or a Logitech ERGO K860 is a better value for most people.

If I were buying an ergonomic keyboard today, with healthy wrists and a small desk, I would not buy the 4000. I would look at the K860 first, then a tent kit for a smaller split keyboard, then the 4000 only if I had a specific injury to manage. The 4000 is a great keyboard for a specific moment in someone’s life. It is not a forever keyboard for everyone.

Verdict

For nine years, this was the right keyboard. For a broken wrist, it was the only keyboard. I am glad I bought it when I did, and I would not buy it again now. The C grade reflects that: a great product for a specific, time-limited use case, not a forever recommendation. If this is your moment — a wrist injury, a chronic condition, an eight-hour typing day on a straight keyboard that hurts — it is an A. If it isn’t, it is a C.

Grade: C. Situational. Right for a narrow use case, or wait for the next rev. In this case, the next rev has been twenty years. There may not be a next rev.

For the nerds

• Product reviewed: Microsoft Natural Ergonomic Keyboard 4000 (B2M-00012 SKU). Wired USB.
• Released: 2005. Still in production in 2026 in the same physical design. Microsoft has not refreshed the hardware in twenty years.
• Layout: Full-size, split, ergonomic. Two key wells angled to follow the natural wrist position. Cushioned palm rest at the bottom. Quiet, low-travel membrane keys. No backlight, no RGB.
• Connectivity: Wired USB. No Bluetooth, no wireless, no dongle, no battery. Plug it in, it works.
• Hot keys: Customizable hot keys at the top for email, calculator, web, search. The zoom slider on the left edge was the signature feature in 2005. I never used it.
• Price when I bought it: Around $90 in 2014. Price in 2026: $140 to $160 retail.
• What I would buy today: The Logitech ERGO K860 ($130) is the modern wired/wireless split alternative. The Microsoft Sculpt (discontinued but available used) is the smaller cousin of the 4000 — same brand, smaller footprint, no zoom slider.
• Why I switched: After nine years, my wrist had healed enough that a straight keyboard was comfortable, and I wanted a smaller footprint and some color on the desk. The 4000 is in a closet now, still working, in case I need it again.

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