I want to send a group email from my Outlook.com account, how do I do it?
You would need to create a contact group:
Go to People, under My Contacts, pick where you want to add the contact group, say Contacts. Click Home > New Contact Group and in the Contact Group tab, in the Name box, type a name for the group. Click Add Members, and then add people from your address book or contacts list.
Home > New Email, in the new email message, click To, Select the address book, in the Search box, type the name of the contact group, double-click the name to add it to the To box, and then click OK.