Rick Lecoat suggested >Which leaves the question of 'when would PM notice that the index was >missing?' I assume that having PM verify the location and condition of >the index on a near-constant basis is not feasible -- too many calls >back and forth between PM and the file directory or something (sorry, >I'm not a programmer). But maybe it should check at startup and at the >start of each search... and perhaps when brought to the foreground?
I leave that detail to the PM engineer, but most likely a good opportunity would be the first time the index is accessed, which beside the moments you describe could be when fetching messages, which contents are included to be in the index. Messages normally are included into the index of course, but mail filters may set them not to be.

