I have an old Microsoft Account that I set up years ago with a POP email address.  

When I setup my new Windows 8 computer, it asked for my Microsoft Account Name and email address, so I the old POP email address.  Then I tried to set up my Mail App on the new computer and that's when the fun started.  I finally realized that it is impossible to add a pop mail account to the Mail App.  So I tried to change the e mail address on my Microsoft Account to an existing Hotmail email address, and in the process, lost admin access, which I could not recover and had to run the recovery discs.  

The Hotmail address was an old one that Microsoft had converted to Outlook.com, so when I set up the computer the 2nd. time, after running the recovery discs, I used the Outlook.com account with the Hotmail address.  That seemed to work pretty good and I even figured out how to forward my pop mail to the Hotmail address so I can now get all my mail in Outlook.com and I could add the Outlook.com account to the Mail App on the new Windows 8.  

But now, it seems that I have the one good Outlook.com account with the Hotmail address.

Then I have another Outlook.com account with the pop email address, (which does nothing) and I also have a "Microsoft Account" with the same pop mail address.  The reason I set up the Microsoft Account in the first place no longer exists, so I don't think I need it.

Question: 

What, if any, problems would I have, if I completely deleted the old Microsoft Account?