domain gone missing, in whois, not in root servers

[Scott Bertilson]

  One of our domains which seems to look just fine from the
perspective of "whois" (see below) comes up non-existent when
we query the root servers.  This is not a new domain.  I
might have believed that we forgot to renew it, but I'd have
thought I'd see some evidence of that in the "whois".
					Scott

> mnexchange.org.
Server:  i.root-servers.net
Address:  192.36.148.17

;; res_nmkquery(QUERY, mnexchange.org, IN, NS)
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 35163, rcode = NXDOMAIN
        header flags:  response, auth. answer, want recursion
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        mnexchange.org, type = NS, class = IN
    AUTHORITY RECORDS:
    ->  org
        ttl = 86400 (1D)
        origin = A.ROOT-SERVERS.NET
        mail addr = hostmaster.internic.NET
        serial = 2000032001
        refresh = 1800 (30M)
        retry   = 900 (15M)
        expire  = 604800 (1W)
        minimum ttl = 86400 (1D)

------------
*** i.root-servers.net can't find mnexchange.org.: Non-existent host/domain

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information about or related to a domain name registration record.
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Registrant:
Znet Inc. (MNEXCHANGE-DOM)
   3515 Hennepin Avenue South Suite C
   Minneapolis, MN 55408
   US

   Domain Name: MNEXCHANGE.ORG

   Administrative Contact:
      HOSTMASTER  (HO2422-ORG)  hostmaster at 2Z.NET
      Znet Telecom
2125 1st Ave.
Hibbing, MN 55746
US

      612 823 1471
Fax- 218 262 0096
   Technical Contact, Zone Contact:
      NTS - Trouble and Repair Desk  (NTA-ORG)  nts at NTS.UMN.EDU
      University of MInnesota
2221 University Ave SE, Suite 145
MPLS, MN 55455
USA

      612 626-1002
Fax- 612 625-0006
   Billing Contact:
      Networking and Telecommunications Services  (NAT2-ORG)  nts at NTS.UMN.EDU
      University of Minnesota
2221 University Ave SE, Suite 145
Attn Chris Ryan
MPLS, MN 55455
US

      612 626-7800
Fax- 612 626-1818

   Record last updated on 13-Mar-2000.
   Record created on 27-Jan-1998.
   Database last updated on 21-Mar-2000 13:05:24 EST.

   Domain servers in listed order:

   NS.UNET.UMN.EDU		128.101.101.101
   NSS.UNET.UMN.EDU		134.84.84.84