We are running a single Exchange Server, version 5.5 SP4 under NT4.0. Our Exchange Server recently suffered a major crash and had to be totally rebuilt. Before the crash users had been able to use OOA without any problems. Since the crash only those users who had not used OOA previously are able to use it. Others can set it up in Outlook and it appears fine but senders do not receive an Out of Office Reply. The problem seems to lie with the actual user accounts because it doesn't matter which client machines I load them on, the accounts that worked previously don't work now. I don't particularly want to have to set up new accounts from scratch if there is any other way round this. I can't see that there is a problem with the actual server since some clients can use OOA successfully. I have run out of ideas - Any help would be much appreciated
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