This project has moved and is read-only. For the latest updates, please go here.

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

The migration of this project to GitHub is now complete.

Open CodePlex Issues and Discussion topics have been
copied across to GitHub, and CodePlex is now read only.

New releases are available on GitHub, so see you there!

A lot of work has gone in to this project, aiming to cater for many different versions of Outlook and types of usage. Beta releases should now be pretty stable, but if you find a bug we'll help squash it! You help is appreciated with reporting any problems.


  • make sure you are on the latest release - ideally alpha if available
  • check an Issue ticket doesn't already exist for your bug
  • post your OGcalsync.log file as per the instructions, otherwise issue may be closed out.
  • do not post issues about Outlook security pop-ups unless you have read and understood why this is happening and have something further to add.

If you would like to
support this tool and its further development

Donate via PayPal

Google+Follow OGcalsyncTweet

Back Links: As endorsed by How To Geek and AbleBits! Also a great install & configure infographic.


  • Supports all versions of Outlook from 2003 to 2016 64-bit!
  • Installable and portable options - even runs from a USB thumbdrive
  • Synchronises items in any calendar folder from
    • Outlook to Google
    • Google to Outlook
    • Two-way/bidirectional sync
  • Includes the following event attributes:
    • Description
    • Location
    • Attendees (including whether required or optional)
    • Reminder events
    • Availability (free/busy)
    • Privacy (public/private)
  • Customisable date range to synchronise, past and future
  • Frequency of automatic syncs, including push from Outlook
  • Configurable proxy settings, or use Internet Explorers
  • Merge new events into existing on destination calendar
  • Prompt on deletion of items
  • Can run unobtrusively in the system tray, with bubble notifications on sync
  • Ability to obfuscate custom words for privacy/security
  • Syncs recurring items properly as a series


  • Match entries on ID key (not a "signature" string)
  • Differential comparison and update only attributes that have changed.
  • Sync non-default Outlook calendar
  • Keep application responsive whilst synchronising
  • Full CSV export

This project has been forked from
The tool did a great job, but the project has fallen dormant and even though people were adding fixes and improvements, they weren't finding their way into the main app.

This project has therefore been created with the aim of maintaining it more actively and adding new features.


Last edited Oct 14, 2017 at 1:55 PM by phw198, version 48