Outlook should disable "Reply to All" when you've been BCC'd.

[montek]

Outlook should not allow BCC recipients from using the "Reply to All" button.
If you've been BCC'd on a message, it's presumably because the original
sender did not want the other recipients to know that you were included on
the message. This "feature" blows your cover.

At the VERY LEAST, it should warn you. I cannot think of a single good
reason to not at least have the warning. This would be very simple to
implement in Outlook and it would prevent a lot of mishaps.

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[Russ Valentine [MVP-Outlook]]

Provide evidence that Outlook does what you claim.
It does not and cannot.

 

[Pat Willener]

You may have misunderstood what the original poster meant. Of course
Reply to All will *not* send anything to the original BCC recipients,
but to all others (From, To, Cc).

Although I personally don't see a problem replying to all, even if I was
a BCC recipient.

 

[Russ Valentine [MVP-Outlook]]

I see.
All email software I know sees it your way and relies on the sender to put
everyone in the BCC line whose identity needs to remain hidden, including on
replies.