That's how it /should/ work anyway, but there's a bug for the O->G part. I've posted a hotfix on github.com/phw198/Outlo... if you would like to give that a try...

It's not quite possible to set it up the way you describe - the closest is "for items created by sync in target calendar" to set an override colour, which will be set in both calendars. Eg set Yellow and you'll know in either calendar that it was synced by OGCS from the other calendar.

It's difficult to tell with such limited information, but I'm thinking you might be getting impacted by github.com/phw198/Outlo.... Try the hotfix posted there and see if it helps?

Release v2.12.1 Alpha · phw198/OutlookGoogleCalendarSync 🔆 Enhancements v2 of OGCS has entered corrective maintenance mode. New features will only appear in v3, though you may choose to remain on v2. 🛠️ Maintenance Application Display any news on sta...

First maintenance release for v2 with #alpha v2.12.1 brings bug fixes and improvement. Staged roll-out already completed and available to everyone. That's a release every month so far for 2026! 😅 github.com/phw198/Outlo...

@ogcalsync.bsky.social your app really is a throwback to the old, pre-enshittified internet. Helpful, just works, then asks for a voluntary donation. 100% worth my money! Thank you!

Release v3.0.1 Alpha · phw198/OutlookGoogleCalendarSync 🔆 Enhancements Application No Outlook client required! Display any news on start up Better presentation on 4k high resolution displays [#2245] Sync Engine Don't delete newly created Outlook it...

📢 Major new release for OGCS with #alpha release v3.0.1 bringing support for Outlook Online calendars and no need for an Outlook client! 🪦
Staged roll-out for existing users may mean the alpha is not available through the app for a few days, unless manually downloaded.
github.com/phw198/Outlo...

Glad you got it resolved! Hopefully you won't need to, but the best way of reporting issues is covered in github.com/phw198/Outlo...

The older version will get replaced yes, but you can always uninstall and go back to a previous version - they're all available under github.com/phw198/Outlo...
Might be worth taking a backup of your settings.xml file first to make rollback easier if you need.

Fantastic! Really pleased Stripe worked - I've spent the last few days setting that up and you're the first to try it out 🥇

Hi and thanks for looking to support with a donation ☺️

I've just been adding the ability to donate via Stripe - take a look and see if that helps! www.outlookgooglecalendarsync.com/donate

Release v2.11.7 Alpha · phw198/OutlookGoogleCalendarSync 🔆 Enhancements Application Validation on browser user agent; always editable [#2195] Log time zone information when a change is detected [#2233] Workaround Google cloud logging losing data that i...

New OGCS #alpha release v2.11.7 brings improvements on 2-way sync and bug fixes! No staged roll-out, so it's immediately available to all #hohoho
Happy Christmas! 🎅🎄🎁 github.com/phw198/Outlo...

Thanks!! Do you have a link to your blog?
Merry Christmas :-)

Are you and to show the issue you are seeing? The Google app is definitely checked and verified; the Microsoft app isn't - is that what you meant?

This blog post has links to it as well as guidance on deploying and running it - www.outlookgooglecalendarsync.com/blog/2025/06...

This blog post has links to it as well as guidance on deploying and running it - www.outlookgooglecalendarsync.com/blog/2025/06...

Release v2.11.6 Alpha · phw198/OutlookGoogleCalendarSync 🔆 Enhancements Application Added "Revoke" button for Google permissions 🐞 Bugfix Application Mask Google auth token file path location Updated default UserAgent string to modern browsers Cop...

Double release day!
Release candidate 2 for OGCS v3 available AND
#alpha release v2.11.6 squashes a few bugs! Staged roll-out for existing users may mean the alpha is not available through the app for a few days, unless manually downloaded. github.com/phw198/Outlo...

An alpha release candidate for OGCS v3 is now available!
See about trying it out and help deliver the next hugely significant milestone: alpha release v3.0.1 ❤️
www.outlookgooglecalendarsync.com/blog/2025/06...

Have you come across phw198.github.io/OutlookGoogl...? I developed this open source project for over a decade now for the exact reason you describe...

Thanks for asking! PayPal should let you pay in USD (though it does charges a poor foreign exchange rate), but I can only receive donations in the one currency of GBP.
OGCS has an option to start the application on system startup - have you tried that?

New OGCS #alpha release v2.11.5 brings bug fixes and preparation for v3 which will support Outlook Online! Staged roll-out for existing users may mean it's not available through the app for a few days, unless manually downloaded. github.com/phw198/Outlo...

A Google bug surfaced on 23-May that may cause OGCS to keep attempting deletion of a non-existant "ghost" item, or fail to sync a copy of it.
A workaround has been released that will stop this behaviour - please apply the hotfix if affected: github.com/phw198/Outlo...

Release v2.11.4 Alpha · phw198/OutlookGoogleCalendarSync 🔆 Enhancements Application Clearer instructions upon Google access token expiry [#2080] Bring application to the front once loaded Switched over from Twitter to Bluesky Sync Engine Abort sync ...

As promised (and a little sooner than expected 😀), a new OGCS #alpha release v2.11.4!
Staged roll-out for existing users may mean it's not available through the app for a few days, unless manually downloaded. github.com/phw198/Outlo...

Donate to Paul Woolcock Help support Paul Woolcock by donating or sharing with your friends.

At over £100 its more expensive though, so any financial support is appreciated 👍
www.paypal.com/cgi-bin/webs...

Meanwhile, the next alpha release should be coming through shortly...

Finally got the new code signing certificate, courtesy of www.certum.eu by Asseco!

This time it's a "standard" certificate which can be renewed each year, so unlike previous years, its reputation won't be lost every 12 months...and install experiences should be cleaner ☺️

Welcome to the new social home of Outlook Google Calendar Sync (OGCS)! Follow along here to keep up to date with new developments and releases...