Microsoft Access Database (.mdb) files don't synchronize with other network .mdb files when you store the files in an offline folder. However, you can work around this problem. To synchronize any file, click Start, Run and run gpedit.msc. Navigate to Local Computer Policy, Computer Configuration, Administrative Templates, Network, Offline Files, Files Not Cached. By default, Files Not Cached is set to Not Configured. Set it to Disabled. Log off, and log on again, and set your .mdb files to be available offline.