Outlook Google Calendar Sync review
A focused Windows utility for keeping Outlook and Google calendars aligned.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Outlook Google Calendar Sync is a free, open-source Windows utility for people who need Outlook calendar data available through Google Calendar, including on mobile devices. It supports classic Outlook as well as newer Microsoft 365 or Outlook Online configurations. The central choice is between one-way and bidirectional synchronization, making it suitable for users who need a controlled flow of calendar information or a closer match between both services.
Its strongest fit comes from the depth of its Outlook–Google Calendar connection. It can synchronize shared Outlook calendar folders along with recurring events, attendees, reminders, descriptions, locations, availability, privacy, and categories. Configurable date ranges help limit the synchronization window, while scheduled and push options provide different ways to keep calendars updated. Proxy configuration, system-tray operation, and a start-on-login option add practical controls for a Windows desktop workflow. Users who need these specific synchronization settings get a more focused tool than a general calendar application.
The product is free and open source, with installable and portable Windows versions. That makes it a practical choice for users who want a single-purpose synchronization utility without a paid tier structure. Its scope is also its main boundary: the platform coverage centers on Windows, Microsoft Outlook, and Google Calendar, so it is not suited to people seeking a broader calendar workspace or a multi-platform application. The official site lists version 3 as Alpha and version 2 as Beta, which is relevant for buyers weighing release maturity. Choose it for configurable Outlook–Google synchronization; choose an alternative if you need calendar features beyond synchronization or a native mobile application.
Questions about Outlook Google Calendar Sync
What does Outlook Google Calendar Sync run on? Windows. It runs as a desktop app.
What does Outlook Google Calendar Sync integrate with? 2 integrations: Microsoft Outlook and Google Calendar.
Who is Outlook Google Calendar Sync built for? Solo users and small businesses (our editorial estimate).
Outlook Google Calendar Sync pros and cons
- Where it wins
- Supports one-way or two-way synchronization
- Syncs shared Outlook calendar folders and detailed event fields
- Offers scheduled, push, portable, and installable operation
- Where it doesn't
- Windows-only desktop coverage
- Focused on calendar synchronization rather than broader calendar tools
- Published versions are listed as Alpha and Beta
Outlook Google Calendar Sync fact sheet, pricing and score →
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