We have a user receiving this error in outlook 2003. the user can access her exchange profile via other PC's and terminal server, but not this particular server. We've not had other users having issues on this terminal server and we've got over 100 users on it. Below is the error:
An extension filed to initialize. Can't open file: extend.dat. The file may not exist, you may not have permissions to open it, or it may be open in another program. Right click the folder that contains, and then click properties to check your permissions for the folder. You don't have appropriate permissions to perform this operation.