M365 Timeslot-Finder for Outlook

About

M365 Timeslot-Finder for Outlook

Stop scrolling through calendars: this extension automatically finds free time slots for all required attendees in your Microsoft 365 Outlook calendar and delivers a ready-to-copy meeting proposal in seconds.

How it works
Enter a search period, a meeting duration, and the attendees you need. The extension queries the Microsoft Graph API to find windows where everyone is available and displays them in a clear list. Copy a single slot or all suggestions at once – already formatted for email or chat.

Features
• Automatic free-slot search across multiple attendees' calendars
• Attendee search by name or email address (from your organisation's directory)
• Flexible search period and selectable meeting duration (15 min to 8 hours)
• One-click copy per slot or copy all at once
• Fully customisable output template with named placeholders (e.g. {{date}}, {{starttime}})
• Modern Microsoft Fluent Design UI with dark mode support
• Available in English and German

Privacy & Security
• No calendar data is stored locally
• OAuth 2.0 with PKCE – no passwords stored, tokens kept in memory only
• Minimal, clearly justified permissions (Calendars.Read, User.ReadBasic.All)
• You supply your own Azure AD Client ID – no third-party infrastructure involved

Requirements
• Microsoft 365 account (work or school)
• Your own Azure AD app registration with the required delegated permissions (setup guide in the README)

This extension is built for IT-savvy users and teams who want to speed up meeting coordination directly from their browser.