Although iTIP specifies the exchange of free/busy information through requests and replies, many mail-based calendar clients do not support these particular operations over e-mail when providing general iMIP support. However, they may support the acquisition of free/busy information over HTTP.
The publishing of free/busy resources for users can be enabled by default in the configuration by changing the PUBLISHING_DEFAULT setting:
PUBLISHING_DEFAULT = "publish"
For this setting to have an effect, the SHARING_DEFAULT setting will need to be changed to enable free/busy sharing by default:
SHARING_DEFAULT = "share"
Users can enable sharing and publishing themselves by accessing their profile in the management interface.
Depending on the Web server configuration, resources are made available at a location resembling the following:
https://webserver.example.com/freebusy/
Individual user data is published in locations like this:
https://webserver.example.com/freebusy/mailto%3Avincent.vole%40example.com/freebusy
Here, the mailto:vincent.vole@example.com identity has been URL-encoded. Web browsers and mail programs may perform such encoding on a location given more informally as follows:
https://webserver.example.com/freebusy/mailto:vincent.vole@example.com/freebusy
However, the properly-encoded version is regarded as the definitive version.