Here is the phrase from Wikipedia:
CFO Peter Klein has said that Microsoft has no alternate plan should its current mobile strategy fail.
Another example:
Should Microsoft’s tablet and phone efforts continue to inspire little interest among the buying public, don’t expect a radical shift in strategy.
What does the word should mean in this context? The same as if or in case?
Why is this verb placed before the subject?
I tried to search in dictionaries, but this specific case wasn’t properly explained.
