Lotus Notes 8 Client crashes and the user is unable to restart the app without a reboot. I see from the forums that programs such as zapnotes and notesnkill have existed for older versions of the client. Now that the Lotus Sandbox is closed and zapnotes is no longer available what else can be done to restart the client without a reboot?
There is normally a zombie process still running on your computer that prevents Notes from restarting. If you kill this process, you can restart Notes without rebooting. Assuming you are using Windows right-click the start bar and choose Task Manager. In the Processes tab you will find a program called notes.exe - select this and choose End Process.
NB The process may have different but similar names nearby in the list - look for lnotes.exe also. I am not on my Windows machine so I can't double check the filenames - I'll edit this answer soon and give a complete list.