How to manage multiple Dropbox accounts on the same computer

This request is a bit vague to me, but maybe I can help.  If you have one computer with three users, then only one person can use the computer and Revit files at one time.  Unless other computers are working concurrently, then no two users will be writing to the fileset at the same time.   While I have limited experience with Revit, I have used SolidWorks for 21 years.  SolidWorks will always look in the local directory first when looking for file references.  This is helpful when opening assemblies across shared dropbox folders.  It works very well.  The problem is with linked library files, but these can be linked to external locations.

I see two opposing requests here.

1. You need three separate dropbox accounts to see (use) a single folder on the same computer (on your C: drive).  While I have done this, it is a bit unstable and I wouldn't recommend it.  Don't point separate dropbox accounts to the same Dropbox folder.  Use a shared folder across the three dropbox accounts.  This works for SolidWorks as long as two users don't overlap a write to the same file.  Even without using a vault, SolidWorks will allow files to be locked or released.

2. You need a common drive letter for Revit's data folder.  I assume each user has a unique Windows login.   It's possible to MAP a drive letter to a folder.  Consider setting the Revit folder to something like M: instead of C:.  Then have each user map the folder address to M:.  Each should be unique and Rev-It shouldn't see the difference.

Wildcard:

3. Use an external sync program like Goodsync to scan a folder for changes and mirror those changes to another folder.  This can be single or bidirectional mirroring.  I've used this with multiple dropbox accounts to sync files across multiple servers.  It seems duplicitous but works very well.  Goodsync would scan for changes and make it all work.  Crazy, but solid.

Best of luck.