No. As of now, notifications are sent only by Email.
Yes, you will receive a notification message when a task is completed. You can configure your notifications in Settings > Email Notification > Configure Notifications.
No. You cannot change the priority names as it is predefined. Customization is not supported yet.
Tasks > Task Lists > Milestones. This is the design flow. Milestones are related only with Task Lists and not with Tasks. A Task List alone can be linked up to a Milestone, where you can create Tasks under the Task List and associate the Task List to a Milestone.
As per the existing design the maximum period supported on the Gantt chart is only 12 months.
Yes, you can print the Gannt view in both landscape and portrait format based on your orientation choice in print settings.
In Zoho Projects, a task cannot be associated directly with the milestones. The task should be associated with the Task List and then the Task List with the milestone. This is because the hierarchy is "Milestone > Task List > Task".
No. You cannot export only the milestones in the current design. If needed, you can export your tasks across projects using the Export option in the My Tasks section.
Yes, Zoho Projects Calendar is integrated with Microsoft Outlook.
Tasks assigned to you will be displayed in your Google Calendar, only when the task is created with duration (Start & End date) and the Add to Google Calendar option is enabled. However, the Add to Google Calendar option is available only for the Google Apps users.