Top 10 Email Social Plug-ins

The product suite transforms your email interface into a collaboration and social workspace, called social email, which is readily accessible to all business users.
Rapportive shows you everything about your contacts right inside your inbox. You can immediately see what people look like, where they're based, and what they do. You can establish rapport by mentioning shared interests. You can grow your network by connecting on LinkedIn, Twitter, Facebook and more. And you can record thoughts for later by leaving notes.
The Outlook Social Connector lets you work in Outlook while staying up to date on the status and activities of your friends and contacts, whether they're from your organization, or from social networking sites on the Internet, like Facebook and LinkedIn.
Lookeen is the award-winning search solution for Microsoft Outlook. With Lookeen you can optimize your search speed for email searches (even for advanced email searches) in Outlook 2003, Outlook 2007, Outlook 2010 or Outlook 2013. The Lookeen indexer makes it possible to achieve each search result in record time
Live Inbox organizes your Outlook mail around the people you communicate with - so that you can work faster and smarter - without requiring you to learn or do anything new. Right within Outlook, Live Inbox automatically creates a rich social profile for each sender along with an easily-accessible list of mails, attachments and links exchanged with the contact in the past.
Mingly helps people stay better connected with an easy-to-use, lightweight relationship management tool. Living right in your Gmail, Mingly aggregates your contacts from Gmail, Facebook, LinkedIn and Twitter into a searchable merged address book. Pulls key updates from your networks, like birthdays and job changes, into a single feed. Makes it easy to send social-network messages without leaving your inbox. Helps you keep track of conversations with contacts across your different networks.
Bring together and merge all your contacts from Facebook, Linkedin, Gmail, Yahoo!, your phone contacts, and other accounts. Enriched with employment, education, social profiles, websites, birthdays, and more. Automatically get the latest contact info for your contacts. Available on Android phones or tablets, iPhone, iPads, and Mac Contacts
Cobook is the unified address book that brings together contact info from your phone, social networks and other sources. Organize contacts with tags. Email or message a group of contacts. Share contact info via email
Taglocity for Outlook is an email management add-in designed to save time processing and finding information. Productivity is the new killer feature! And it's fully featured and completely free!
Evercontact intelligently scans your incoming email & auto-enriches contact details in your address book and CRM. Working silently in the background, Evercontact analyzes signatures in your email, and registers (and constantly updates) valuable contact details directly into your GMail and Outlook contacts.