On February 15, 2017, we'll be upgrading FogBugz On Demand to version 8.17.657. We will upgrade accounts gradually from 1500 ET to 1800 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.