Known Issue: Long running upgrade / Plugin activation
Although we improved the performance, updating to version 1.3 or activating the plugin may take some time to synchronize with the internal Confluence groups, if you have a lot of extranet spaces, users or groups.
This can be fastened up for future updates if you uncheck the Synchronize users and group memberships on plugin updates or reactivation option.
For the search for mail adress to work, a reindex of users is nessessary. This is done on plugin installation, if you haven't disabled Activation Tasks, otherwise you can re-build the whole search index manually