Until now, co-authoring an Excel file in the Office 365 Excel app unlike Word or PowerPoint, was not possible. Recollect, how you would get a pop-up dialog that showed you that file is locked by [insert co-worker name here] and you could either open read-only version, be notified when file was available to edit?
Sync Issues with OneDrive for Business Next Gen Sync Client – Solved.
I came across an interesting issue recently at a client site. They are using SharePoint Online in their Office 365 Enterprise E3 subscription. The issue on hand was with OneDrive for Business sync of their SharePoint libraries. Content sync was intermittent and most times it would fail. As a result of which the content was being saved on local machines. That’s not great, especially with everything being in cloud, no backups of local machines and the users having to save files locally, email each other or if uploaded to SharePoint Online, collaboration was not as effective as it can be with SharePoint Online.