Microsoft Office has been upgraded with very advance feature like online office 365. Now Just do single Office Login and get have access to all of product and services - excel,oneDrive,Word,etc.
For getting Office services online you should have account and then login.
If you are facing any login error during connecting office product to online server and you have attempted many. But have not good satisfaction still.
So go to take help of any support person, who can help. Find with google or Click here to contact - http://officelogin.org