Certainly. You can define the level of access to each others data using Data Sharing Settings in Zoho Support. You can create sharing rules for all the modules apart from the organizations default share settings. You can provide the following types ...
No, you cannot delete a Department. Instead you can edit & change the Department name. Or To stop fetching e-mails to that Department, Goto Setup > Admin Settings > Mail Server Settings >Stop Fetching for the Mail account associated with that ...