1. Groups
   1. Administratoin Can contain: publ folder trees, servers, policies, routing groups, etc
      1. policy - groups of params implements to 1 or several Exchange Obj.
         1. System.
            1. Mailbox DB storage
            2. Publ folder DB storage
            3. Server policy
         2. Recipient
   2. Routing contains some exchange SRV's connected with high-speed comm-lines, eaxh SRV can be in only one R.Gr. Messages deliver between SRVs in one R.Gr deliver directly, between diff R.Gr delivers through special bridges-SRV, through connectors
2. connector application provides communication between Rout. Gr. or another mail-systems
   1. sending messages directly
   2. sending contacts
3. Services
   1. System Attendant
   2. Information Store
   3. Routing Engine
   4. Subtopic 4
   5. Subtopic 5
4. Transaction
   1. operation. adding MSG to Private folder
   2. operation. deleting MSG from Inbox
   3. update information in folders
   4. fix transaction in temporary log
5. Groups
   1. routing
      1. servers with good comm line
      2. Connectors
   2. administration
6. standart
   1. storage gr: 1, databases: 2 for each st.gr, 1 mail and 1 publ folder, size db - 16 Gb, Without X.400 Connector, cluster isn't supp.
7. enterprise
   1. storage gr: 4, databases: 5 for each st. g.r, size DB - 16 Gb, X.400, Cluster is MS Cluster