So you've noticed that Access doesn't play well with Dropbox? Because Dropbox uses a synchronization process to put a local version on your desktop, all kinds of nastiness can happen. Your data can overwrite another person's data when you sync back to dropbox. Your Database structure changes may conflict with someone else's changes. And of course, there's a host of corruption errors we've seen occur. Solution? Don't use dropbox but instead move your data file to MySQL or SQL Server. We prefer MySQL because it's FREE. It has all the features you as an Access Developer/User need. It will hold an immense amount of data (far more than Access), and it is powerful and fast.