This must have happened before this switch of any activity extends the life of your miles because all unexpired miles got a 3 yr extension. United had, I think for two years, a way of extending miles for 1 more year. I don't remember where I had seen this (perhaps at their web-site) and was able to "save" my daughter's expiring miles by doing this. Now I am attaching different credit cards to different programs so not only can we eat out more than once a month and get miles, but accounts will easily be kept active.
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DtG