"Unable to calculate clock skew:" when accessing an Exchange 2010 mailbox if RpcClientAccessServer is set to a CAS array using (Microsoft) Network Load Balancing (NLB).
An error similar to the following example can be observed in a WLOG file generated by the Exchange Store Manager (ESM) service:
09:09:01 DEBUG: GuessExchangeVersion returns 00000000,ExchangeVersion=2010
09:09:01 ERROR: Unable to calculate clock skew:
09:09:01 NetRemoteTOD(\\CAS_array_name):
09:09:01 [00000035] The network path was not found.
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