Hi Brian,

I think we may detect the change of web service in client code. For
example, when it call the web service and failed for some reason, it may
throw such an exception and tell user the web service call failed and he
may expect a new update for his client application avaliable soon.

Anyway, we had better update  the client and web service at same time, so
this problem wouldn't happen.

Sincerely,

Luke Zhang

Microsoft Online Community Support
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