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A use of “should” [duplicate]

I don't get to understand the meaning of "should" in this sentence. She stared out of the window with her lips pinched together, and it seemed quite natural that the rain should have begun to ...
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0answers
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The verb “should” as a conjunction [duplicate]

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 ...