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Welcome to Microsoft Community! I understand that you have your duplicate contacts on your Windows Live Mail after you've synched 3 of your account.

 

"Since the merging of my Hotmail account with Outlook plus with Gmail+ and others accounts, all contact lists in such accounts have now"

 

Regarding the above statement, please provide us the exact steps you've made to merge all 3 accounts that you have. This will help us to provide you appropriate solution needed.

 

If your contacts were added by connecting it to your 3rd party account, please be informed that you can't delete them. To be able to delete a duplicate contact from your 3rd party account, you have to delete it on your 3rd party account (i.e facebook.com, twitter.com, etc.).

If not, I suggest you to delete all duplicate contacts by performing the solution provided below.

 

There's 2 option on how to delete duplicate contacts on Windows Live Mail.

 

1. Open your Live Mail.

2. Click Contacts on the lower left corner of your page.

3. Click Clean up contacts on the Home Tab before your name, this will lead you to connect on your web page account.

4. Click Save.

 

Or

 

1. Sign in to People

2. Click Manage.

3. Click Clean up contacts.

4. Click Save and continue button.

 

You don't need to delete all your contacts and start all over again. Clean up will help you to delete all possible same contacts that you have on your Contact list.

 

this is so very wrong doesn't work.