Microsoft Access is the most widely used database system in the world. More then 40 million companies use it. When correctly used, Access offers an excellent alternative for the bigger database systems like Oracle, DB2 or SQL Server. When you have a lot of users connected at the same time to a database (50 and more...), Access is not a logical choice but for up to 20 users it's the most economical solution because of the rapid development environment.
The use of Microsoft Access helps reduce development costs and time and you don't need a big technician team to take care of the database. Just make periodic backups like for any other database system.