Do you have a new AutoSave icon in the top left corner of Excel?
When this lights up, watch out, because you will be destroying data soon.
The feature to allow multiple people to edit a workbook at the same time is called CoAuthoring.
I need to Co-Author in 0.00001% of my Excel sessions.
Co-Authoring was hard to implement, but it is finally done.
So I am thrilled 0.000001% of the time.
But 99.9999999% of the time, we have to deal with AutoSave, which is horrible.
You have to change your workflow. Don't count on Save As after you make changes.
You have to Save a Copy before making changes.
When you forget, (and you will forget), use the dropdown in the title bar to go back.
Please vote: AutoSave Master Switch rather than an "I Told YOu...