Recently my wife received the letter below reminding us that she had United miles due to expire in a few months. I keep a pretty good spreadsheet but actually zero’d out these United miles because it was less than 2k. The letter suggested using them for magazine subscriptions. While not a bad idea for such a low amount of miles, she has a lot of Chase Ultimate Rewards that can be transferred to United so I would rather try to keep them. I will be buying some needed items from Home Depot through the United Shopping Portal in order to reset the expiration date a least another 18 months. Shopping Portals or Dining Portals are typically the easiest way to show activity on an account and reset the expiration dates. I appreciate the reminder from United though!