Windows 10: Outlook Calendar Color Category Keeps Changing / Reverting

I am using MS 365 on a windows 10 PC. In outlook calendar, my Color Categories or "Categorize" color function stopped working a few months ago. pre windows 10. All of my custom color categories disappeared and the Categorize Color tab reverted to the standard "Blue Green ... etc." My custom descriptions are still in each specific calendar entry - however they're grayed out. If I re-do the whole thing, it lasts for a few hours at most then reverts again. I have tried some troubleshooting that lasts for a short time, then reverts again. I cannot contact any support at MS, but have tried

:)

 

Outlook Calendar events changed color.

If you go to your calendar.

Then click on Calendar on the left (or hover over), three dots appear, click on dots, a colour option should appear.

 

Outlook Calendar events changed color.

My hero! Oh thanks so much Ken! Everything is back to normal. I keep trying to use the Thank button but it says that I must spread some reputation before thanking you again. Thanks Ken for being persistent and solving my problem *Smile

 

Outlook mobile customization

Hello,

• Is it possible to customize tab colors in outlook mobile appointments in week view?
  

• When I use a 'show appointments without categories' filter in outlook mobile, every time I switch back from another application, outlook mobile reverts back to showing calendar without filters applied. Is there a way to change the default view
  to a filtered view showing no appointments without categories?

Thank you.