Special Edition Using Exchange Server 5.5 ISBN: 0-7897-1503-1 There is an error on pages 663-664 regarding the utility mtacheck.exe and its command line parameters. The book makes reference to two parameters, specifically /rd and /rp, where... "/rd stands for repair database... /rp stands for repair postoffice. This switch is similar to rd but it specializes repairing corrupted postoffices..." However, as one of our readers pointed out, a reference is also made to the mtacheck.exe utility and its command line parameters. On page 171 the parameters for /rd and /rp are slightly different. "/rd Removes any directory replication messages found in the /MTADATA directory. /rp Removes any public folder replication messages found in the /MTADATA directory" The latter reference is correct and the text should be amended as such.