On a computer, go to Outlook.com and login using your old Hotmail details, then click the little arrow next to the Outlook logo near the top left. This will drop down a little menu, click on "People". Do you see all of your contacts? If so, click Manage at the top, then click Export. Then save the exported file onto your desktop for example. Log out, now log into your new account and do the same and go into "People". Instead of clicking Export, click "Add people", then click "Import from file". Now choose the exported file which you saved earlier. All your contacts should now be in your new account.