Odoo version policy
At the time of writing, Odoo's latest stable version is version 12, marked on GitHub as branch 12.0. This is the version we will work with throughout the book. In recent years, major stable versions have been released on a yearly schedule, in October, at the annual Odoo experience conference.
The last three stable versions are supported. With the release of 12.0, versions 11.0 and 10.0 are still supported, and version 9.0 stopped being supported. This means it will stop receiving bug and security fixes.
It's important to note that Odoo databases are incompatible between Odoo major versions. If you run an Odoo 11 server against a database created for a previous major version of Odoo, it won't work. Non-trivial migration ...
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