We have a fix for this issue which may have been a setting re-enabled or altered by an office update
Within Outlook
--> (Top menu) File
--> Account Settings (Box in right hand pane)
--> Account settings (Drop down menu)
--> Change (small option top menu)
--> More Settings (button at bottom of window(
--> Advanced (Tab at top)
--> Disable / Untick "Download shared folders"
Outlook will make a change --> Click DONE
Outlook should restart