When you turn on a brand new Windows Phone for the first time, you will be prompted to create a Microsoft Account on it. [See the article entitled, “What is a Microsoft Account?” to learn about the fundamental ways that the Microsoft Account is used on a windows phone.]
If you already have a Microsoft-related account that you use, you don’t need to create a new account. You can use the username (which is an email address) and password of your preferred Microsoft-related account when you create the Microsoft Account on the phone.
When you create the Microsoft Account on the phone, you may notice that the only data that can be selected to sync under the “Content to sync” heading is Email, but if you set up a secondary hotmail.com, live.com, or outlook.com account on the phone, you will find options to sync Email, Contacts, Calendar, and Tasks under the “Content to sync” heading.
|Primary Microsoft Account||Secondary Account|
Because Contacts, Calendar, and Tasks are not included under the “Content to sync” heading of the Microsoft Account Settings, some users mistakenly think they need to set up another account that uses the same username and password as the Microsoft Account in order to sync this data from that account to their phone. But if you try to set up the account again, you’ll probably find out that you can’t do it.
A second account on the phone that uses the same username (email address) and password as the Microsoft Account is not required to sync Contacts, Calendar entries or Tasks to a phone. What is not intuitively clear when setting up the Microsoft Account is this:
When you create the Microsoft Account on the phone, the default setting for the account is to sync any Contacts, Calendar appointments, and Tasks that are stored on the online account to the phone and there is no way to prevent these items from syncing to the phone.
The only item that might be associated with the Microsoft Account that you can enable or disable syncing to the phone is Email.
If you mistakenly create two accounts on the phone that sync data from the same account….
I have read a few forum threads in the Windows Phone Answers community that lead me to believe that some users have been able to create a second account on a Windows Phone that uses the same user name and password as the Microsoft account. I’ve never been able to replicate this on my own windows phones, but If you manage to create a second account on the phone that syncs to the same account, you’ll find that all your Contacts, Calendar appointments and Tasks are duplicated on the phone. In which case all you need to do is delete the second account that you created to get rid of the duplication.