You have to be active at least once a year. If you go more than a year without any activity, you will lose your points. They do send a reminder at 10 months. I have only gone 10 months once.I used to travel ALOT for a former employer and stayed exclusively at Holiday Inns. Needless to say, I amassed a ton of reward points.
For the past few years I redeemed enough points for 1-2 nights per year for an occasional overnight trip. Last month I logged on to their website and found they had erased/deleted/stolen the remainder of my points. I had enough points to cover 14-15 nights. When I called them, they explained that it was due to my non-activity on their website. I went as high as I could over the phone and talked to 3 different supervisors. None of them would reinstate my points.
Recommend that those of you who also think you have a lot of IHG points to check your balances......I'll sleep in my truck before I ever stay in another IHG-owned hotel.