Full replacement of name and color for a category. Reserved (system) categories reject this operation with 403 / errorCode 5 (CannotModifyDefault).
Documentation Index
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x >= 1Category updated
Inbox thread category. Reserved categories are owned by the system and cannot be modified or deleted.
64Gray, Green, Blue, Red, Yellow, Purple, Orange, LightBlue, Olive True for system-reserved categories (e.g., the default category). Reserved categories cannot be renamed, recoloured, or deleted.
Number of unread threads currently assigned to this category.