For Outlook Desktop (Microsoft 365 or Office 2021/2019)
- Open Outlook.
- Click File > Automatic Replies (Out of Office).
- Select Send automatic replies.
- You can set:
- Time Range: Check “Only send during this time range” and set start/end times.
- Inside My Organization: Type the message for coworkers.
- Outside My Organization: Optionally set a message for external contacts.
- Click OK to activate
For Outlook Web (Outlook on the Web / Outlook.com)
- Go to https://outlook.office.com and sign in.
- Click the gear icon (⚙️) in the top-right corner > View all Outlook settings.
- Navigate to Account > Automatic replies.
- Turn on Automatic replies.
- Set the time range (optional) and type your message.
- Optionally:
- Send replies to people outside your organization.
- Block the calendar during this period.
- Click Save.
Read more: Convert Thunderbird to PST