upgrade help

Kindly i need your help and support to get more information about the use of some Features when i upgrade to take my decisions" outlook plug-ins: dose this mean to have the format and tools of outlook or to use zoho mail in my outlook , mail add-ons is this meant to connect my email with zoho recruit or another thing , Number of recruiters this mean the number of the users or the recruiter that have the full access to zoho recruit" thx for help and support .