Use an online CSV-to-ICS converter, such as CSV to iCal Convertor. Upload your CSV file, following onscreen instructions. Choose a time zone and an output name and click the "Convert" button ...

Avoid manually entering events. It's easy to add iCal invites (.ics files) to your Google calendar if you follow these simple steps.

Open the Outlook recipient's response email in Lotus Notes, and then double-click on the ICS file attachment to open the Import window.

Microsoft is investigating an issue that triggers Outlook security alerts when trying to open .ICS calendar files after installing December 2023 Patch Tuesday Office security updates.