I have developed an app which uses the outlook dll. It intercepts text messages and stores them in a pimcollection in order to be stored with contacts. I use the following components SMSinterceptor, Formlib, SMS, Contact and Pimcollection. This application just runs smoothly, does what it should do and is supposed to run in the "background". The strange thing is that as soon as I switch on my PDA decice (after it went to sleep mode or was switched off manuallly) and re-active the window of my application it just closes unexpectedly. Is this known behaviour or an existing problem? Or is the OS trying to shut down apps? Thanks for you help in advance.