
The WorkPad z50 was released in 1999 for $999 to presumably take the role of a mimic thin client in the corporate realm. Being that it wasn't fully a laptop, and not fully a PDA, the exact [nature] of it was sort of confused and lost: most people don't even know that this exists. IBM sharply discontinued them in 2000. Here's a brief excerpt from the press release regarding the laptop (and it looks like my suspicions of it gearing towards a thin client role were correct):
The new WorkPad z50 complements IBM's thin client initiative for the enterprise -- the IBM Network Station -- by offering the best of connected network functionality as well as core information processing capability when disconnected from the network. With Microsoft RDP client software or Citrix ICA (R) Client software, the WorkPad z50 can be used as a mobile terminal to run corporate desktop applications that reside on enterprise servers. By offering desktop and mobile thin-client devices, IBM once again illustrates its commitment to information devices used by businesses for Internet access, groupware and data retrieval.
It's not easy to understand [why] this was made. Probably one of the most bizarre products: the WorkPad z50 has the reputation of the most fully featured Windows CE machine ever made with a full sized keyboard, audio out, a TrackPoint etc. One advantage this machine has is that it comes with AA battery packs to replace the [now] long exhausted lithium ion batteries: and as these are capable of taking linux, you can build yourself a miniature linux laptop that runs off of AA batteries. It has a very light plasticy feel to it (although the build quality is still impressive as it has a tiny magnesium rollcage despite the outside plastic), being very light and not too far off from the IBM PalmTop. The screen is a passive matrix, so it's rather blurry and not very inspiring at all.
Downloads
Manuals
Windows CE
New in box these came with "Desktop Software for Microsoft Windows CE" (while there are many versions, the WorkPad z50 specifically came with 0198 X03-48101), which appears to be packaged software for an opposing Windows machine to connect Windows CE with. Mine is still sitting sealed.
Deluxe Leather Carrying Case
The WorkPad also had an (and rather elaborate) optional leather carrying case. They retailed for over $250, so only a serious user of the WorkPad would have purchased one. The carrying case however has 'ThinkPad' tags all over it; as if that the lesser WorkPad users needed some more credibility to mask the fact they weren't using a ThinkPad? Whatever the case, the whole package was not cheap.

The 'WorkPad' is 'ThinkPad' proven.

Specifications
Quickly Sold Off
I recently heard in a voice call from Neozeed that retailers 'back in the day' were trying to get rid of all of the z50 peripherals and add-ons as quickly as possible: marking them down for cheap to be included essentially for free with the whole systems. I guess inventory wasn't moving and they had SO MANY add-ons for these things and they needed to shove them in the hands of whoever walked by that was even vaguely interested in buying a z50 itself. I don't know who at IBM thought this product and its many trinkets was going to be a hit-- you can tell they had high hopes for it with how much junk was made, but it was always clearly going to be a huge bust. The passive LED screen with Windows CE for $999 was already pretty weird, a fully fledged ThinkPad just made more sense.