Tasks list can be exported to Excel or Outlook. Click on Settings icon in the right corner above the list & find Export List option.
You will be able to export the default set of fields only. Please make sure you have enabled all default fields inside task list setting (added all available columns to the list) in order to have them exported.
Export to Outlook
You need to configure Bitrix24 & Outlook export just once, further the synchronization will be performed automatically. The following fields are synchronized between both Outlook & Bitrix24: task name, description, status, priority, responsible person, deadline, planned start date.