On June 7th, 2016, we'll be upgrading FogBugz On Demand to version 8.16.1. We will upgrade accounts gradually from 0800 ET to 1700 ET. We do not expect any downtime during this window.
After your account has been upgraded, at your next local midnight, your account's database will receive a schema upgrade. You may see a service interruption of up to 5 minutes when this occurs.