A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hello Konrad,
Thanks for your time and patience. I will help you further.
I understand that you are experiencing synchronization issues when co-authoring with different versions of Office on different devices. I'm sorry to hear that you are having this problem.
I recommend that you ensure that all users are using the latest version of Office. This will help to ensure that everyone is using the same version of the software, which can help to prevent synchronization issues.
Additionally, you may want to consider using the Office web apps for co-authoring. The web apps are designed to work seamlessly with each other, regardless of the operating system or device being used. This can help to ensure that everyone is working on the same version of the document, and that changes are saved and synchronized in real-time.
I hope this information helps.
If you have any further questions or concerns, please don't hesitate to ask. I'll be glad to help you further.
Thanks for your time and understanding!
We hope you have a nice day. Stay safe and healthy always.
Sincerely,
Tina | Microsoft Community Moderator