We do not use activities, so a feature as written above could be in that service.
When you hand-over projects it would be great to send/forward/delegate a folder with content to a collegue.
Most simple would be the option to select the folder and choose 'forward folder'. ...
When archiving with a "all documents not access in" or "not modified since" selection the calendar profile document seems to get archived too. Hence a nice user now becomes irrate user due to their signature, mail and view customizations disappearing.
Now, this maybe to the letter of the law ...