Possible but hard.  You need another Exchange Server to do it.  From the
Tivoli Site:
(http://www.tivoli.com/support/storage_mgr/pubs/v3pubs/v1_html/msexc/ab5etfrm.htm)

The procedure to restore one or more individual mailboxes (or messages or
folders within a mailbox) requires the use of an Exchange Server that is
separate from your current Exchange site. This separate server must have
sufficient disk space to restore the entire Information Store. The
procedure is as follows:
   1.      Set up a Windows NT server to be your individual mailbox
     recovery server. This server should have the same version of NT with
     the same or higher service level. Ensure you use a unique machine name
     within your NT domain.
   2.      Install the same version of Exchange Server at the same or
     higher service level. You must configure the Exchange Server with the
     same organization and site name (but you will have a unique server
     name). Also, it is important that you do not select Join Existing Site
     during the installation. Select Create a New Site. Otherwise, you
     could end up with two sets of mailbox data for the same users after
     completing this procedure.
   3.      Install the same version of the Exchange Application Client at
     the same or higher service level.
   4.      Use the Exchange Application Client to restore the Information
     Store for the Exchange Server containing the individual mailbox to be
     recovered. Follow these steps:
        a.      Create a TSM options file with the same node name and
          parameters as used by the Exchange Application Client on the
          original Exchange Server. If PASSWORD GENERATE is used by the
          Exchange Application Client on that server, you might need to use
          the DSMCUTIL program on that system to obtain the current
          password for that node. You should not use PASSWORD GENERATE on
          this machine.
        b.      In the Exchange Application Client GUI:
             i.      Select the IS database and the TSM server icon
               representing the options file with the correct node name and
               TSM server information. This was created in step 4a.
             ii.     Select the Restore tab.
             iii.    Select the Show All button to get a list of the backup
               objects for that node.
             iv.     Select the Information Store database you want to
               restore. This also includes any associated incremental
               backups or differential backups as required. Select the
               Restore button.
   5.      Run the DSIS consistency checker, which populates the Directory
     Service with information from the restored Information Store database.
     For more information on the DSIS consistency checker, see your
     Microsoft Exchange Server documentation.
   6.      Log onto the administration program and assign permission to the
     mailbox or public folder you want.
   7.      Log into that mailbox on the Exchange client.
   8.      Copy all mailbox information to an Export file to give to the
     user for whom you are doing the restore.
   9.      Instruct the user on how to load the mailbox from the Export
     file.

-> Mark
                                                                                
                                                                                
                            
                    "Ulbrink,                                                   
                                     
                    Birger"                To:     ADSM-L AT VM.MARIST DOT EDU  
                                            
                    <Birger.Ulbrink        cc:                                  
                                     
                    @METRO.DK>             Subject:     Tivoli Data Protection 
for Microsoft Exchange Server         
                    Sent by: "ADSM:                                             
                                     
                    Dist Stor                                                   
                                     
                    Manager"                                                    
                                     
                    <ADSM-L AT VM DOT MARI                                      
                                            
                    ST.EDU>                                                     
                                     
                                                                                
                                     
                                                                                
                                     
                    01/11/2001                                                  
                                     
                    09:42 AM                                                    
                                     
                    Please respond                                              
                                     
                    to "ADSM: Dist                                              
                                     
                    Stor Manager"                                               
                                     
                                                                                
                                     
                                                                                
                                     



Does anyone know weather it is possible to restore a single mailbox and
have
you tested it?


Med venlig hilsen / Kind regards
Birger Ulbrink
Netværksadministrator / Network administration

METRO Cash & Carry Danmark ApS.
IT afdelingen /  IT department
Ejby Industrivej 111
DK 2600 Glostrup

Tel      +45 43467700
Tel      +45 43467819 (direct)
Fax     +45 43452321
Email   Birger.Ulbrink AT metro DOT dk <mailto:Birger.Ulbrink AT metro DOT dk>