From the OOXML Specification: A comment is a rich-text note that is attached to and associated with a cell, separate from other cell content.
In Office 365 there are two types of comments:
This item applies to Comments/Notes only.
For Threaded Comments, please follow: SpreadProcessing: Comments (Threaded Comments)
Add support for conditional formatting of cells - allow applying of rules used during visualization of cells to automatically apply formatting depending on their values.
The named ranges are not updated after rows or columns are inserted.
The vertical grid lines are not visible in a scatter chart. The grid lines are visible when opened in Excel.
The content of some rows which contain new lines can be clipped when a fixed-width column is wrapped.
This can be observed in the following images.
Before the export:
After the export: