A balloon message appears saying: "Error filing email"
For more information about the error open the Mail Manager Dashboard e.g.
From the Windows Notification Area (bottom right-hand corner of the screen) select the Mail Manager icon and choose "Show dashboard..."
Select the Session Log tab
The following error appears:
Failed to file email:
Unknown Error.
Error: 0x80040155, (-2147221163)
Function: Arup::Mapi::MapiProp::copy
Context: CopyTo.
This error indicates that Mail Manager is unable to communicate with the Outlook's data source.
Ensure Outlook is configured to use "Cached Exchange Mode"