"Ghost" conference rooms say they can't be booked.

Some users say that they get this error message (altered names to protect the
innocent) when booking conference rooms. They do NOT select ANY of these
names and YET they appear!

Users are in Outlook 2007 on XP Pro x32 SP2 and Vista x32 Business from
Exchange 2003 SP2 x32 R2

Over two months ago the accounts were deleted in Exchange and new ones
created. They do NOT appear in the GAL (Global Address List) and do NOT
appear in System Manager when I looked for them in the Mailboxes.

Your message did not reach some or all of the intended recipients.

Subject: LaVisit
Sent: 8/22/2007 2:51 PM

The following recipient(s) cannot be reached:

ConferencePTp on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1

ConferenceH2E on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1

ConferenceDFA on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1

ConferenceAnti on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1

ConferenceAtive on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1

Conference208 on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1

Conference2015 on 8/22/2007 2:51 PM
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.
EMAILServer.SERVER.com #5.1.1