Access Sharing database over Network vs Mysql multiple users
When the own vendor says the following:


  "While Microsoft Jet is consciously (and continually) updated with
  many quality, functional, and performance improvements, it was not
  intended (or architected) for the high-stress performance required by
  24x7 scenarios, ACID transactions, or unlimited users, that is,
  scenarios where there has to be absolute data integrity or very high
  concurrency."
  
  "When you need unlimited users, 24x7 support, and ACID transactions,
  Microsoft strongly recommends that you use Microsoft SQL Server with
  Internet Information Server (IIS). "


I wouldn't have many expectations for integrity and performance for multiple users over a network.