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Usernames of some of the users is showing in following format.


Is it possible to solve it?

Strangely 80%-85% usernames do not face this issue.

Any help is appreciated!

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Just to add here that I have read that a Cumulative Update solves this issue but don't know which! – neo269 Jan 24 '12 at 9:09

Check that the users have first and last name defined in SharePoint User Profile database - and in your case in the ASP.NET user database.

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