I've found that any email in response to existing calls that are at Resolution status work fine - they update the call and unresolve it as our process is designed to do.
Unless they have embedded images or attachments, in which case we get the generic "Could not find Process" error
The mail mappings all look OK.
Before I log a call I'm wondering whether the Resolution status needs to have an Add attachment collection for this to work.
I can't test now as our dev system has no email functionailty so will test tonight - but if this is unlikley the case then I need to log a call asap.
So I'm hoping others have seen this or have more info.
Many thanks - Adam.