First take notes as to when was their last log-in date.See if they were an EA
their first month.
Click on their name and go to their V.P. Ledger if they had more than 1500 v.p. their last month here.
If it was a while since they logged in,provide them with links to what has changed.A list would be help too.
Contact them by using an e-card.That way they can see your picture.
welcome them back and let them know you are here to help them.Tell them help is also with their 3 up-line,Forums,Ask SC, and also look under Support for help.