21 Feb 2014
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14 Mar 2016
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The "Last Known Password" field stores the password that is used when first creating the Portal User. If the user changes their password in Sitefinity after the user is created, the password change will not be reflected back to Dynamics CRM. In the upcoming TPC 3.3 release, this field will be cleared out after being sent to Sitefinity so not even temporary passwords will be stored in Dynamics CRM.
If you have any other questions please don't hesitate to ask.