Mail Dispatcher Agent: Could not access the outbox folder (Unknow error. (Failed to fetch the resource collection.)) Why am I receiving this error message on Kubuntu since I upgraded to 12.04 and how can I make it stop appearing? It appears as a pop up balloon above the system tray. `Mail Dispatcher Agent: Could not access the outbox folder (Unknow error. (Failed to fetch the resource collection.)).`

This forum thread discusses the issue and includes various solutions/workarounds, such as deleting `/.config/akonadi`,

> Rather than removing the akonadi configuration, I edited `~/.config/akonadi/aknoadiserverrc` and changed `StartServer=true` to `StartServer=false`, and then rebooted (although logging out and back in should have been sufficient). (1)

or this one

> Hi, I had the same problem here, also on a Kubuntu system that has undergone many distribution upgrades.
>
> I found the following solution without having to delete Akonadi's configuration or disabling it completely: **In the "Akonadi configuration" dialog (where you configure the Akonadi ressources), I had an e-mail ressource named "Local Folder". Deleting it made the startup warning go away.** (2)