Good news for everyone looking for Windows CE support in POCO. We have created a port of the POCO C++ Libraries to Windows CE 6 based on the current 1.3.7 branch. The port should work on Windows CE 5.x as well, however, testing has only been done on a Windows CE 6 device. There are a few minor restrictions to some POCO features, due to restrictions in the Windows CE operating system (e.g., no support for environment variables, no pipes), but apart from that, almost all libraries can be used.
More information about the Windows CE port is available here.