Category colors in Outlook changed on upgrade to 64-bit

[JN-waves]

Had Windows 7 for too long, upgrades to Windows 10 then Office Apps and Outlook upgrade right after, but it installed 32-bit office.

Migrated to a new Exchange hosting provider and simultaneously with the cutover uninstalled Office/Outlook 32-bit and installed 64-bit. Created a new profile in Outlook and the new mailboxes, which synced/populated smoothly.

However, the colors and names I had specified in Calendar > Categories reverted to defaults and the default color for all my generic no-category calendar entries went from generic/gray to Blue.

Is there any way to globally change those colors and names back to the way I had them before?

[#2 · Accepted solution]

Found the solution. In lefthand pane, on the name of the calendar, right-click and change Color, which is the default color for all items in that calendar which were not assigned a Category/color. In the past, it was gray. It became blue, which I use for a certain Category. I changed it there to gray and that changed all items in the calendar that didn't have a Category assigned back to gray.

[#3]

This ability to specify the default color for un-Categorized calendar items can help tell which calendar the given items belong to when viewing multiple overlayed calendars, but it seems one would have to be very deliberate about assigning different Category colors for certain uses in the various calendars or the benefit of different colors for un-Categorized items will be useless.