Moving/Linking Claims Windows Auth user to an ADFS Claims

Hi guys, 

Here is my situation:

Initial deployment: SharePoint 2010 with Windows Authentication - Users login using AD

We successfully migrated the web application to use "Claims"

We then integrated the web application with ADFS 2.0 - Using the same AD users

Everything seems good and working fine. 

The question I have is related to content already created in SharePoint. Is it possible to map the new ADFS account usernames to the existing windows authentication claims usernames?

This is important for users, because we would like the "My" views of lists and libraries to work. SharePoint at the moment thinks that the logged in users (using ADFS) is different than the user who created/modified the documents. (Although it is the same AD account)