It's this simple: in the "AD Users and Computers" console, right click on a domain user and select "Exchange Tasks". On the wizard, select "Create Mailbox", click Next, let the wizard finish and... ¡nothing happens! Move to Exchange Administration console and the mailbox is not there. The administrative and storage groups are correct, the LDAP path for the user seems right. No errors, no warnings. Turned on maximum logging for every Exchange service; it fills the Application log in a few seconds, but no errors are reported. Have someone experienced this before? Something within the Exchange-AD system is failing, does someone know where could I look for error messages or whatever? I'm really confused, can't find a single clue on this. The environment is: Small Bussiness Server working as Domain Controller and Exchange Server. Every product updated to the latest Service Pack available. Thank you in advance.