Outlook can export calendars in the standard iCalendar format (.ics), which NimbleCal can import.

Option A: Outlook desktop app (classic Outlook for Windows)

1. Open Outlook.
2. Go to the Calendar view.
3. Select the calendar you want to export.
4. Use File → Save Calendar to save an .ics file (you can usually pick a date range via More Options).

If you do not see File → Save Calendar (for example, you're using Outlook for Mac or the "new" Outlook), use Outlook on the web (Option B) or use Google Calendar as a bridge.

Option B: Outlook on the web (published calendar link)

Some Outlook accounts let you publish a calendar to get an .ics link.

1. Open Outlook on the web.
2. Open Settings (gear icon) → View all Outlook settings.
3. Go to Calendar → Shared calendars → Publish a calendar.
4. Choose the calendar and publish it (use "can view all details" if available).
5. Copy the ICS link, open it in a new tab, and save the downloaded .ics file.

Note: Some organizations disable calendar publishing. If you do not see this option, use Outlook desktop export instead.

Import into NimbleCal

1. In NimbleCal, in the left sidebar under My Calendars, click the + menu.
2. Choose Import calendar.
3. Click Browse files.
4. Select your .ics file.
5. Choose + New (recommended) or Existing.
6. Click Import events.