Is it possible to access archived activities (Tasks and Events) via DemandTools?
Yes, starting in DemandTools version 2.5 archived Tasks and Events (Activities) can be exported via MassEffect. Previous versions do not support exporting archived activities. More information on how to export archived activities via MassEffect can be found here.
Archived activities can also be deleted or updated via MassEffect although the "Restore File" option (for updates) will need to be unchecked as they cannot be accessed via a RETRIEVE call which is what is used to create restore files.
OTE: Archived activities can ONLY be updated using MassEffect (cannot be accessed in other modules, i.e. PowerGrid or MassImpact). When matching to Tasks or Events in Find/Report ID's ONLY unarchived records will be returned. There is currently no option to return archived activities.