Per default the capability 'drive' is globally disabled now. Instead it is selectively enabled for all users that have the 'infostore' permission set. That is realized via config cascade (see http://oxpedia.org/wiki/index.php?title=ConfigCascade for details).
Configuration file changes:
'com.openexchange.capability.drive' defaults to 'false' now in 'drive.properties'.
/opt/open-xchange/etc/contextSets/drive.yml was introduced. It sets 'com.openexchange.capability.drive' to 'true' for all users with 'infostore' permission. File content:
premium:
com.openexchange.capability.drive: true
withTags: ucInfostore