i have the same problem:

Error:
avast!: unable to connect to the avast! engine. avast! mail protection cannot be started. The operation completed successfully.

Error:
The add-in “C:\Program Files\Alwilsoftware\Avast4\ashOutXt.dll” Could not be installed or loaded. This problem may be resolved by using Detect and Repair on the Help Menu.

I remember that all works fine with version 4.5x. With the new one 4.6 i get these error messages.

I deleted that entry in the registry and deleted the extend.dat and it works, but the outlook plugin/the provider didn’t start resp. it is not possible to start the provider even when outlook is open.

What is the difference between the outlook provider (that didn’t work) and the internet mail provider?