The new unified API provided by apache poi 3.5beta will be used to export search results in betacms-webui module in Excel format.
The implementation will assume that the exported list contains content objects of the same content object type. The first object in the list will be used to determine the content object type for the whole list. If an object is found that has a different content object type it will be omitted.

The exported fields will be the title,description,subject,created,modified fields from content object profile as well as the root content object properties that are not complex. At a future version it will be possible for the user to select the desired field to export.

Multivalue Simple properties are supported. The values are exported in the same cell separated with new lines. The height of the row that contains multivalue fields is appropriately adjusted so that all values are visible.

The width of all columns is also automatically adjusted to present the full contents of each field.

It seems that there is a problem with fields that contain html / xml content. This should be investigated.