If you choose to link this account with your Xbox Live account, we confirm key data points across the accounts by sharing data such as your name, address, email address and date of birth with the partner. In this TOU update, customers agree to allow Microsoft to share this information in this manner.
Here is the statement in full:
From time to time, we update and add to the features and services that we offer through Xbox Live. For instance, we recently retired Microsoft Points in favor of local currency.
We recognize that some parents may not sign into their Xbox Live accounts as often as others, and they may have trouble remembering their login details. Now is a great time to recover that information so that you can be ready when the updated TOU rolls out to your family’s accounts.
As part of the new agreement, we’re happy to report that parents will only need to accept the TOU once for all the children in their home. We hope this will make this process easier for our customers.
Protecting your account from unauthorized access and fraud is a top priority for us. It helps keep Xbox Live safer and more secure for everyone. That’s why the TOU now asks all users to commit to keeping their contact information up to date. By the way, now is a great time to make sure your security proofs are valid and accessible to you.
More app experiences available via Xbox Live are provided by a partner with whom you may have a separate online account. If you choose to link this account with your Xbox Live account, we confirm key data points across the accounts by sharing data such as your name, address, email address and date of birth with the partner. In this TOU update, customers agree to allow Microsoft to share this information in this manner.
Source: Xbox Wire