A nice touch by United to send this out...
Dear bmvaughn,
We are excited that you are approaching a remarkable milestone: flying one million miles with United® and MileagePlus®. Once you are a 1 Million Miler, you will enjoy benefits that reflect your accomplishment, including status that will not fall below Premier® Gold.*
We look forward to welcoming you as a 1 Million Miler in the near future.
Sincerely,
Thomas F. O'Toole
President, MileagePlus
Senior Vice President, Marketing and Loyalty
United Airlines
I applaud UA for sending this out to folks who are close to MM (I am ~34k away), hope they sent something similar to existing MMers to thank them for their loyalty over the years.