A Rule is basically an instruction for Microsoft Outlook to follow. So, you can instruct your Outlook to follow one instruction by setting up a rule. Basically Outlook rule will allow you what to do when you receive a mail from particular person or with particular subject line to your inbox. By defining a rule you can automatically move a mail coming from your personal friend to a personal folder...
What is a Rule in Microsoft Outlook, How to Configure Outlook Rules ?
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