# Upgrading Dovecot v0.99.x to v1.0¶

The upgrade from Dovecot v0.99.x to v1.0 isn’t just a drop-in upgrade, but also requires the administrator to adjust the configuration in several places, as detailed in the chapters below.

## Configuration file¶

The configuration file has had a lot of changes, so it’s better to just modify the included dovecot-example.conf file manually. The easiest way to remember what you had changed in the old file is with grep: