If you are currently utilizing the MySQL database on your server, it is important to verify which engine you are currently using.
In order for IceWarp databases to function properly, foreign keys are required. The recommended database engine to use is InnoDB.
If you are currently using a different engine, such as MyISAM, which does not support foreign keys, upgrading to EPOS may result in issues with table creation due to missing foreign keys. This could result in certain features becoming inaccessible.
To avoid this problem, it is best to migrate your databases to new ones with the correct settings. You can check your current database engine using the command “show create table *table_name*”.
If you need to migrate your databases, an internal migration tool is available in the Administration Console.