[snoopen]

Word Processors for one, and possibly the whole Office suite.

There have been no significant updates to sore points in Word such as: bullets and numbering that are convoluted to create and can completely corrupt; VBA IDE is probably unchanged since the 90s and the language itself has had little to no improvements.

Office 365 has only made things worse: collaboration features will randomly drop your formatting; auto-save can disable itself in some conditions; even with auto-save on, there can be significant lag between collaborators.

PowerPoint, years ago, lost the ability to record macros... it's still missing even though you can write macros and run them.

Don't even get me started on how much of a joke their "OpenXML" format is.

There's been so much potential in the Office suite that's been squandered by MS focusing on adding half baked features rather than making a truly solid product.