The OnceHub integration with Exchange/Outlook Calendar works regardless of whether you are using Exchange in cached mode or non-cache mode. The Cached Exchange Mode is the default mode in Outlook and is the recommended option to optimize performance.
The performance of the connector will be affected depending on the mode that you have enabled in Outlook:
When using the Cached Exchange Mode, a copy of your Exchange/Outlook Calendar is stored on your computer. This copy provides quick access to your data and is frequently synced with the Exchange server. The cached mode is less memory and CPU intensive on both the client-side and the server-side than the non-cached mode, improving performance.
If you are using Exchange/Outlook Calendar and working in non-cached mode, Outlook is retrieving data from the server on any sync. This means that Outlook and the connection to OnceHub will respond slower than in the Cached mode.
If you are experiencing slow performance in your connection to OnceHub, the first thing to check is that Cached Exchange mode is enabled. Learn more about turning on Cached Exchange/Outlook Calendar Mode