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Once you enable Facebook chat on your WP, you can see an app is added to your Facebook account as other apps (like photos or candy crush) and all these apps will use your all personal information. They can save all the info to their server. But with my experience Microsoft is able to show you all the history of your chat on Microsoft account. That means they are storing all the chats done through Microsoft app and not the chat happened from Facebook chat app.

"Microsoft" here referring to the Facebook app.

In WP 8.1, Integrated Facebook chat is removed.

Once you enable Facebook chat on your WP, you can see an app is added to your Facebook account as other apps (like photos or candy crush) and all these apps will use your all personal information. They can save all the info to their server. But with my experience Microsoft is able to show you all the history of your chat on Microsoft account. That means they are storing all the chats done through Microsoft app and not the chat happened from Facebook chat app.

"Microsoft" here referring to the Facebook app.

Once you enable Facebook chat on your WP, you can see an app is added to your Facebook account as other apps (like photos or candy crush) and all these apps will use your all personal information. They can save all the info to their server. But with my experience Microsoft is able to show you all the history of your chat on Microsoft account. That means they are storing all the chats done through Microsoft app and not the chat happened from Facebook chat app.

"Microsoft" here referring to the Facebook app.

In WP 8.1, Integrated Facebook chat is removed.

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source | link

Once you enable Facebook chat on your WP, you can see an app is added to your Facebook account as other apps (like photos or candy crush) and all these apps will use your all personal information. They can save all the info to their server. But with my experience Microsoft is able to show you all the history of your chat on Microsoft account. That means they are storing all the chats done through Microsoft app and not the chat happened from Facebook chat app.

"Microsoft" here referring to the Facebook app.