I'm finding that when a category is repeatedly added and removed from an email using the online Outlook interface, eventually (after 3-4 times?) the category simply doesn't get applied anymore. It will show on the email, but when you navigate to another folder and back it disappears. You can add it using the Microsoft Graph API, but the interface will no longer function for that particular email.
In the outlook.com web version of outlook 365 you can categorize an email but you cannot filter emails in the inbox to see the emails that have been categorized like you can do in the desktop version. What is the point of having categories? For example, if I have a category in my inbox called "To Do" I cannot see the emails that fall under this category. Can you please reinstate this filter in the web version also?
Please add email categories
should be useful first to be able to rename a category and secondly to create a sub-category under a current one in order to keep things more organized.
Would be nice to have Category organize as a tree so we could organize them by topic and sub-topic.
Have the Category tree expose to the user to browse for easier navigation
You can create a Favorite for a Category which is great, but it would be wonderful if the category then showed how many unread messages were in that category. This would allow people to auto sort their mail with incoming mailbox rules and still know if they are getting additional messages into different categories.
Categories that have been created disappear from Categories list. I have to re-create the same category multiple times even though I can find past emails marked with the same category.