We are running SBS2003 with exchange 2003 sp1 with Outlook 2000/2003 clients. Users can collect email via POP3 from the exchange server but cannot log into the server using MAPI as they get the error "The action could not be completed. The bookmark is not valid".
After reading various ms articles I have found dc/gc errors and the correct dc records did not appear to be in place. Found that the domain was set up with a single label dns domain, i.e. domain. was used instead of domain.local.
After correcting registry entries to allow single label domain names, and rebooting - see q300684- DNS seems to be working properly. Still no change when trying to log into exchange. Using ldp.exe I have examined user records to find them missing the critical attribute showInAddressBook - see q821908. This appears to be the key to the problem. I have added new users since correcting the dns problem but still no showinaddressbook attribute.
Any advice is desperately welcomed! We are keen to have users accessing the mailboxes directly.