Earlier this year I took over EwsEditor from its prior owner and have been updating it to update it for Exchange 2013 and include additional processing. This month did two releases of changes and fixes. If you are not familiar with EwsEditor then be aware that its a very large sample of code written in C# which uses the Exchange Managed API to do various operations. One way to think of it is as a the MFCMapi of EWS.
Here is a summary of the changes done over the past several months...
188.8.131.52070 - 5/16/2013-12/18/2013
If you run into any issues or have comments then please post them below. Keep in mind that this is a sample application and as such has no support. However, I try to fix bugs as they are run across and as time permits.