Duplicate Detection does not run on create in the new form experience in the Microsoft Dynamics CRM Online December 2012 Service Update

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Microsoft Dynamics CRM 2011 More...Less

Symptoms

After applying the Microsoft Dynamics CRM Online December 2012 Service Update, users may notice that duplicate detection does not run after creating duplicate records in the new form experience. Per the default duplicate detection rules, these forms may include:

Contact
Account
Lead

However, if additional duplicate detection rules have been created for Opportunity or Case, these rules will not take effect in the new form experience for these entities as well.