How can I connect with someone I previously had an online meeting with?

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Go to Finished Calls and then look through your call history (they are listed by date of the call) until you find the person you are looking for. Then click on their name and you'll be sent to their profile page.

 

 

At their profile page you can then send a message, a Connect Now request (if they are online and accepting connections requests), or a Calendar request if they have filled out a calendar.