Exchange 2013: Webmail Error. TokenMungingException

Microsoft.Exchange.Security.Authentication.TokenMungingException

Exchange 2007 user moved to Exchange 2013.

Webmail gives this error

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something went wrong
Sorry, we can’t get that information right now. Please try again later. If the problem continues, contact your helpdesk.

In the URL, you can see this error code.

errorfe.aspx?httpCode=500&owaError=Microsoft.Exchange.Security.Authentication.TokenMungingException&owaVer=15.0.847.32

With a google search, a thank you to

http://social.technet.microsoft.com/Forums/exchange/en-US/e3f0a5a8-b267-4ad6-a23b-c6c9c8c27cc5/what-is-a-tokenmungingexception?forum=exchangesvrclients

http://rickrbyrne.wordpress.com/2011/06/27/convert-linked-mailbox-to-user-mailbox/

You can see this with

[PS] >get-user myUser  | fl *linked*

IsLinked            : True
LinkedMasterAccount : ********

And can be fixed with

[PS] >get-user myUser| set-user -LinkedMasterAccount $null
[PS] >

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