In Dynamics CRM 2011, we can create workflows that get triggered on create/update of records within our system. A common example is where a new Lead comes in, and a workflow is triggered (on create) which emails the Lead, sent from the Lead Owner.
This kind of scenario is fine, as it makes sense for the email to come from the Owner of the Lead, since they are the User dealing with the prospect.
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In another scenario though, where you want to send an email to a group of Leads, you would require the use of an on-demand workflow. ...