Depends on how you are integrating Outlook to Salesforce. If you are using the older "Connect for Outlook", then there is a regedit setting that must be set in order for the validation rules to fire.
In the O_Dictionary.xml file, you need the following OverrideOptions:
Hi,
Follow below links. Hope it fulfill your requirements.
http://developer.force.com/cookbook/recipe/blocking-record-creation-with-cross-object-validation-rules
http://www.youtube.com/watch?v=UO2X7rjjGBQ
Depends on how you are integrating Outlook to Salesforce. If you are using the older "Connect for Outlook", then there is a regedit setting that must be set in order for the validation rules to fire.
In the O_Dictionary.xml file, you need the following OverrideOptions:
<PutRegistry name="UseWorkflowRules" type="string" value="true" />