In my domain we have a relatively small file server running Server 2012 R2.
A few different users from the same department are complaining that when they open a few spreadsheets Excel will NOT notify them that someone already in it. To avoid work loss they will both have to waste time and Save As to combine work between files.
I've seen people recommend the checkbox to allow multiple users in the same file at the same time, but we do NOT want that checked. Every time someone opens a spreadsheet the next person's entries depend on the most up-to-date numbers possible.
I've heard of DFS flying around occasionally when researching this issue, but I don't know a lot about it. Is this something I could look into for a resolution?