Sync without the Outlook client!

[phw198]

For over a year and since Microsoft have started rolling out the New Outlook client, I have been developing a version of OGCS that does not depend on any Outlook client at all. Instead, OGCS will connect to your Outlook calendar in much the same way as it does for Google (using OAuth) and authorising OGCS to manage your Outlook calendar.

🎉🎉 It is now available as a release candidate for v3.0.1.0! 🎉🎉

As this is a major new feature, it will be found in v3 releases. v2 will still be available and maintained, but only for bug fix - no new features will be added.

⚠️ A few features are not yet implemented for Outlook Online, such as colour/category sync.

👀 How It Looks

On the Outlook settings tab, you'll find a new section for "Outlook Online / Microsoft 365" with similar options and a familiar account authorisation mechanism as found in Google settings tab.

If the classic Outlook desktop application is still installed, the previous options are still available under the "Office Outlook 'Classic' Client" section. If the Outlook application has been uninstalled, or you have migrated to the New Outlook, this section will be disabled.

🚧 Setup Recommendations

At present, v3 is only available as a portable ZIP release. Until the first v3 alpha release, it is recommended to run v3 separately to any v2 installation.

💡 Although not necessary, you may wish to create a new dedicated calendar in Outlook and/or Google for OGCS to sync with, until you are happy v3 functions well for you and has all the features required.

• Download v3.0.0.30
• Create a new directory for the portable release, eg in Windows Command Prompt:-

mkdir c:\temp\OGCS-v3
cd c:\temp\OGCS-v3

• Copy in your settings file from your existing installation using Windows Explorer or eg:-
  • If your previous settings contain Profile(s) requiring the classic Outlook client that is no longer installed, these Profiles will be automatically removed after you have been given the opportunity to backup your settings.

copy "%appdata%\Outlook Google Calendar Sync\settings.xml" .

• Unzip the development build into the new directory
• Run OGCS v3

call OutlookGoogleCalendarSync /t:"v3 Development Build" /s:.\settings.xml /l:.\OGcalsync.log

📦 Development Builds

First, download and extract the most recent full ZIP release v3.0.0.30 and then apply later versions as a hotfix, if available.

Version	Type	Release Date	Notes
3.0.0.30	Full ZIP ⭐	31-Aug-2025	Alpha v3.0.1.0 release candidate 2! Fixes from:- v3: Do not force connection to Outlook client #2170 v3 deleted items not anonymized in log #2149 Incorrect reporting of number of items sync'd (when there are errors) #2150 Not handling COM error properly: [0x8001010A] RPC_E_SERVERCALL_RETRYLATER #2165 Calendar sign-in web view version issue #2154 "Outlook security settings may not be optimal" message if Outlook not running before starting OGCS #2163
3.0.0.16	Full ZIP ⭐	14-Jun-2025	Alpha v3.0.1.0 release candidate! Merged in v2.11.5
3.0.0.15	Hotfix	09-May-2025	Merged in v2.11.4 Removed reliance on classic Outlook client
3.0.0.14	Hotfix	06-Mar-2025	Merged in v2.11.3 2-way sync Exclusion options implemented CSV output files
3.0.0.13	Full ZIP ⭐	08-Feb-2025	Merged in v2.11.2 Miscellaneous fixes

Archived Versions

Version	Type	Release Date	Notes
3.0.0.12	Hotfix	12-Jan-2025	G->O: Create & modify recurring series with exceptions New recurring exception emoji
3.0.0.11	Hotfix	04-Jan-2025	O->G: Create & modify recurring series with exceptions
3.0.0.10	Hotfix	23-Dec-2024	G->O: Create simple recurring series Compare simple recurring series
3.0.0.9	Hotfix	01-Dec-2024	O->G: Create simple recurring series Merged in v2.11.1
3.0.0.7	Hotfix	26-Oct-2024	Scope consent fix
3.0.0.6	Hotfix	03-Aug-2024	Start, end & time zone improvements
3.0.0.5	Hotfix	22-Jul-2024	Reclaim items, extirpate properties
3.0.0.4	Hotfix	20-Jul-2024	O->G: Update existing single instance items Merged in v2.10.6
3.0.0.3	Hotfix	04-Jul-2024	O->G: Create & delete single instance items
3.0.0.2	Hotfix	27-Jun-2024	G->O: Update existing single instance items
3.0.0.1	Full ZIP ⭐	16-Jun-2024	G->O: Create & delete single instance items

🗒️ Progress Summary

📈 Project KanBan to track individual development items / issues

Development Remaining

• No category/colour sync
• No GMeet conference detail sync