It's been a while since we visited the OpenNETCF.Deskop.Communication library, but there have been lingering issues that ActiveSync 4.x have exposed (a stack imbalance exception). So today I revisited the library and did some fixes to it as well as to the sample app (bad, bad me for not marshaling calls to the UI from a thread. It's now a Studio 2005 project.
The latest code is in Vault and the downloads on the site are updated to this new version (2.9) as well.