After upgrading a Sharepoint environment from Sharepoint 2010 to Sharepoint 2013, users started to panic.
Why? Because some strange characters were added to their account names. To give you an example:
“Lastname Firstname (i:0#.w|domain\accountname)”
Did something strange happened during the migration that changed all the accounts? No, this is actually a feature. What you see is the claim information about this user.
How do you need to decode this claim information?
- i an identity claim
- # user logon name
- . of type string
- w windows account
More information can be found here: http://www.wictorwilen.se/Post/How-Claims-encoding-works-in-SharePoint-2010.aspx