Some are more equal than others.

I just updated the signature on a number of Excel .xlam add-ins after the signing certificate expired. When I opened each, Excel behaved in three different ways:

• No complaint at all
• Yellow bar, “macros are disabled”
• Scary warning dialog, “problem with this file, signature expired”

All for the same kind of file, signed with the same since-expired cert.

Huh?