I have an exchange 2007 environment with about 30 domains in it. We bought a Unified Communications Certifiate for our main domain, call it domain1.com This had the following names in it: mail.domain1.com autodiscover.domain1.com server5.domain1.local This stopped the certificate error popping up when we opened outlook, at least for the people who have a domain1.com email address. Unfortunately for users of the other 29 domains they get a certificate error on launching outlook and other things such as using "out of office". The error says "autodiscover.domain2.com - The cert is trusted, The cert date is valid, The name on the cert does not match" I cannot put all domains in the cert and I cannot buy 30 certs, so how else can I resolve this problem? I found this on technet but I don't quite understand it so if anyone could better explain I would be very greatful. Thanks, Leigh

For that number of domains you basically have two choices. 1. A certificate that supports the number of domains - they are available, but will cost. You may have to use a different certificate provider. 2. The SRV record or redirect method. SRV records may well mean that you have to move the domains to a provider that supports them. Many DNS providers do not. SRV record method: http://support.microsoft.com/kb/940881 Redirection method: http://technet.microsoft.com/en-us/library/ff923256.aspx No idea what the link you have provided is - I don't click on random shortened URLs. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

Thanks I think I will try using the SRV method as our hosting company (heartinternet) seem to support it. To confirm, am I right in thinking I should do the following: Remove all A & C Name entries in domain2.com DNS for autodiscover.domain2.com Add a SRV record into domain2.com DNS which says: service: _autodiscover protocol: _tcp server: domain1.co.uk port: 443 Just not 100% sure I've got the 1s and 2s in the right place? Thanks, Leigh