Since Microsoft Update servers will recognize a KMS-activated copy as a "non-genuine installation" if patched incorrectly, the Black Edition usually has automatic updates disabled. This leaves you vulnerable to thousands of known CVEs (Common Vulnerabilities and Exposures) in Office 2013, including remote code execution flaws in legacy Excel formulas.
The "Long Term Servicing Channel" is the modern legal equivalent of the Black Edition. It is volume-licensed, has no features updates, and lasts 5 years. Purchase a genuine key from a reputed reseller ($50–$150). has no features updates
It stripped away the heavy gradients of the 2010 version in favor of a flat, modern look. Technical Requirements (32-bit & 64-bit) has no features updates