Can you do a search over all the metadata for the names when using ADSI?
Instead of going to each individual that you think might have the name stuck?
There is no search or find option when using the ADSI console.

"TeeCee" wrote:

When sending an invitation to another with Calendar, this message appears:

The e-mail account does not exist at the organization this message was sent
to. Check the e-mail address, or contact the recipient directly to find out
the correct address.

I have already renamed the person't *.nk2 and have manually deleted the name
when it appears in the address line. Does not work. I logged out and back
in.

I've looked at exchange legacyDN with ADSI edit also to the possible people
with this deleted user. I don't see this person on delegates or anything in
their Outlooks either.