Technote Details :: Problems connecting to Microsoft Access databases

When using a Microsoft Access database file (.mdb) as the database for a your web application, insufficient permissions can result in one or more of the following error messages:

"Microsoft OLE DB Provider for ODBC Drivers error '80004005' [Microsoft][ODBC Microsoft Access 97 Driver] Couldn't use '(unknown)'; file already in use."

or
"Microsoft OLE dB Provider for ODBC Drivers (0x80004005) [Microsoft][ODBC Microsoft Access Driver] The Microsoft Jet database engine cannot open the file '(unknown)'. It is already opened exclusively by another user, or you need permission to view its data."

or
Microsoft OLE dB Provider for ODBC Drivers error '80004005' [Microsoft][ODBC Microsoft Access 97 Driver] Couldn't lock file.