# Outlook calendars and Excel plans, synced into twelfth

> Connect Microsoft 365 to read an Outlook calendar or an Excel worksheet in OneDrive or SharePoint as a twelfth calendar. Your files stay the source of truth.

New. Published 2026-09-29.

Microsoft 365 teams can now keep their dates where they already are.

Connect the workspace's [Microsoft 365](https://twelfth.ai/integrations/microsoft-365) account, then in [Settings → Calendars](https://twelfth.ai/app/settings/calendars) choose **Outlook Calendar** and a calendar and timezone, or **Excel workbook** and a worksheet from OneDrive or SharePoint. An Excel worksheet is checked column by column, exactly like a Google Sheets tab.

Reading is the normal sync: twelfth never writes to your calendar or workbook unless an admin separately grants write access for a template. See [Microsoft calendars and Excel plans](https://twelfth.ai/docs/settings/integrations/microsoft-365/calendars-and-excel/).

## Try it: It is in twelfth now.

Signed in to twelfth? Open it in your workspace. Not on twelfth yet? Book a demo and we will show it on your own range.

- [Open Calendars](https://twelfth.ai/app/settings/calendars)
- [Book a demo](https://twelfth.ai/book-a-demo)

## More updates

- [twelfth is now in Claude](https://twelfth.ai/news/twelfth-in-claude) — 5 October 2026, News. Add twelfth from Claude’s connector directory, then sign in and choose the workspace you want Claude to read.
- [Use a monday.com board as a planning calendar](https://twelfth.ai/news/calendars-from-monday) — 24 September 2026, New. Connect monday.com once, choose the board your team plans on, and twelfth reads its items as trading, promotion or custom calendar dates. Read-only.

Source: https://twelfth.ai/news/calendars-from-outlook-and-excel