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May 9, 2021
May 9, 2021
Aug 23, 2017

Outlook Google Calendar Sync

Offers calendar synchronisation between Outlook and Google, including attendees and reminders.
Completely free, no install necessary, works behind web proxies and actively developed.

🚨 Not using OGCS yet? Get started over on the user site. 🚨

Continually Improving

A lot of work has gone in to this project.
If you would like to support me and further development of this tool, please donate
If you find a bug, help squash it! 🐞

Downloads & Statistics

⚙️ See the wiki for install, configuration guides and more.

Latest Beta Release: Latest Release Latest Release downloads

💾 Installer

📦 Portable ZIP

ℹ️ Upgrades to this release

Latest Alpha Release: Latest Release Latest Release downloads

💾 Installer

📦 Portable ZIP

ℹ️ Upgrades to this release


  • Supports all versions of Outlook from 2003 to 2019 64-bit!
  • Installable and portable options - even runs from a USB thumbdrive
  • Synchronises items in any calendar folder, including those shared with you, from
    • Outlook ➡️ Google
    • Outlook ⬅️ Google
    • Outlook ↔️ Google (two-way/bidirectional sync)
  • Includes the following event attributes:
    • Subject
    • Description
    • Location
    • Attendees (including whether required or optional)
    • Reminder events
    • Availability (free/busy)
    • Privacy (public/private)
    • Colour / category (custom mappings supported)
  • Differential comparison updates only attributes that have changed
  • Customisable date range to synchronise, past and future
  • Frequency of automatic syncs, including push-sync from Outlook
  • Configurable proxy settings, or use Internet Explorer's
  • Merge new events into existing on destination calendar
  • Prompt on deletion of items
  • Ability to obfuscate custom words for privacy/security
  • Option to force items as private in target calendar
  • Syncs recurring items properly as a series
  • Can run unobtrusively in the system tray, with bubble notifications on sync
  • Application can start on login, with delay if required


Screenshot1 Screenshot2 Screenshot3

Previous Codeplex Project site.