Hi everyone. I recently migrated from excgange 5.5 to exchange 2003 within a 2000 domain environment.During the migration period i had occasions when the 2003 exchange would be unavailable. in the event viewer i had ldap errors and global catalog complaints. however these stopped when i removed my 5.5 server and i put it down to the ad connector. However this problem has now showed up a gain and the exchange machine has again started becoming unavailable. if it is left it will eventually find the Global catalog after 20 mins and be fine . if i restart the machine it will be fine but this is obviously not ideal. Any ideas ???