The CRM Monitor account sync windows may suddenly display "Unable to connect to Exchange due to missing timezone information".
Riva expects a Microsoft timezone-related patch to be present on the Exchange Server, but the patch is missing.
To resolve the missing timezone information error:
Article ID: 262
Last updated: 28 Apr, 2016
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Riva On-Premise - CRM Sync -> Manage Riva On-Premise (Admin Guides) -> Troubleshooting (Includes Monitoring) -> Resolving Exchange Connection Issues