How issue our own cert after buying one

Is there way that we  could buy a single cert for our  cert authority and then issue our own for webmail , ssll vpn and other uses. I know they sell certificates that could be used for multiple domain names (i.e, but I was wondering if I could by one and then issue my own as much as I want. We have Widnows 2003 servers.

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You can't do this and have it "trusted". You're talking about a self-signed certificate which you can do, but all the browseres will issue warnings.  If you just want the encryption, it will work.

See for a decent description.

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