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My APO chapter does it from time to time.
Generally speaking, any contact with alumni will yield updated information. Prior to us using a website where alumni could update their own data, one of the pledge service projects was usually contacting the alums to update their data. (Maybe not every semester, but at least once every two years.)
Depending on the reason, brothers in the chapter might do it outside of pledging season, too.
But utilizing pledges shouldn't be the only method. I suggest that, an annual mailing, and a website where the alums can update it on their own.
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