if I delet hotmail what happens

I have messages all over the place because I am getting incomplete answers. Sorry if I have passed my confusion to everyone but - maybe this will clarify. My Nokia 925 at&t tells me that Hotmail is my calendar and People account and ******@Cox.net Is my email account. My email, working thru Office 365 (no exchange, I am a retired person) is working beautifully. What happens if I delete Hotmail? Is there some other way to get my Outlook calendar and Contacts to sync? The contacts in Hotmail were put there some time ago and are incomplete. I have never run any calendars thru Outlook.com or Windows.Live or whatever. If I go back to Factory and start over, is there some way I can run everything from Outlook 2013 (Office 365), including ******@Cox.net, thru Outlook.com so it can manage synchronization? If I could only understand all this mess...