A user of the Sunbird Messaging tool is facing the problem that the synchronization of his calendar with the application does not work. Despite the calendrical integration supported in the tool's description, there seems to be problems with the linking of calendar data. This can lead to appointments and events not being displayed or updated correctly and therefore cause difficulties in planning and organization. Uncertainties in the settings, supported calendar formats, or server problems could be possible causes of this problem. Thus, there is a need to find a solution that allows the user to successfully synchronize his calendar system with Sunbird Messaging and fully utilize the functionality of the tool.

To solve the problem, the user can try to check and update the settings in Sunbird Messaging. First, they must make sure that the calendar format they are using is supported and that the correct server information has been entered. Then, they should restart the synchronization process to connect their calendar with Sunbird Messaging. Lastly, the updated and smart folder features of the tool can also contribute to ensuring a successful synchronization and display of calendar data. It is important that the user has a complete overview of their appointments and events to ensure optimal planning and organization.