By default, most shared folders that users access in other mailboxes are automatically downloaded and cached in the users' local OST files when Cached Exchange Mode is enabled. Only shared Mail folders are not cached. You can use this setting to change this behavior so that non-mail folders are not downloaded automatically.
| Registry Hive | HKEY_CURRENT_USER |
| Registry Path | software\policies\microsoft\office\16.0\outlook\cached mode |
| Value Name | downloadsharedfolders |
| Value Type | REG_DWORD |
| Enabled Value | 1 |
| Disabled Value | 0 |