When I trying to access our LDAP directory using MS Outlook 2002 or 2003 I recieve the following error: "Unavailable critical extension" and then "the action could not be completed". After these errors it allow me to search the LDAP directory.
The problem does not happen with Outlook Express, Netscape or any other client to my knowledge, only Outlook. We are using ADAM (active directory in application mode) as our ldap server. The problem is not machine specific as it appears to occur on any machine running Outlook.
On a side note: Our ldap directory contains approx. 15,000 names. I believe the problem begain occuring sometime after 10,069 names. I'm not sure if it's some kind of limitation or if there is a configuration problem on the ldap server. As I said before it only occurs using outlook.
Any thoughts on what is causing the problem and how to fix it?