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Exchange 2010: Expired Certificate Still being used

dejected asked
Last Modified: 2015-08-07

I am getting error id 24 in MSExchange Web Services on my Exchange 2010 SP3 server - says certificate expired. That certificate has expired but I renewed it and imported the new one and assigned all the services (except unified messaging which we don't use) to it.

a) am OK to delete the old certificate?
b) why is it still being used for exchange Web Services (assume autodiscover and owa) when it does not have the IIS service role added to it?
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