I thought about mentioning that one. But unless your company is guaranteeing zero downtime, I'd run it by the lawyers first. To me, most of the other expressions imply intent, while zero downtime implies a promise. rwl On 23/08/2012, at 12:08 PM, Stuart Burnfield <slb@xxxxxxxxxxxxxx> wrote: > Hi Howard. > > IBM use the phrase 'zero downtime'. It's the 'z' in z/OS, latest incarnation > of their mainframe operating system formerly known as MVS and then OS/390. > > Stuart