@samppp
You can do this by using the Settings Catalog. In Intune go to Devices > Windows >Configuration Profiles > create a new policy > set profile type: Settings catalog > when you add setting search for 'cached Exchange mode' (see attached screenshot). You can use 'Use Cached Exchange Mode for new and existing Outlook profiles (User)'. Here is how Microsoft describes this setting:
"By default, users can choose to configure Cached Exchange Mode or use Online mode. By enabling this setting, new and existing Outlook profiles are configured to use Cached Exchange Mode. Disabling this setting configures new and existing Outlook profiles to use Online mode."
Be aware that Microsoft recommends using cached mode by the way, see here for example: https://support.microsoft.com/en-au/office/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221...
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