With proper permissions, you are able to do many actions with leads and contacts from Salesforce inside Outlook. This requires both a Salesforce license and a Salesforce Inbox license. Those may be requested by your supervisor via a helpdesk ticket.
To install Salesforce for Outlook, please follow these instructions
The proper way to add the Salesforce Add-in is via the “Get Add-ins” button within Outlook.
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Click the “Admin-managed” and click “Add” by the Salesforce one.
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