Exchange certificate for Exchange 2010

[Koofler]

Does anyone have an recommendations for buying an SSL cert to allow Outlook over http etc?

£150 for 3 years cert is the best I've found so far.

[Koofler]

I've been pointed to these guys who seem uber cheap: http://www.ssls.com/comodo-ssl-certificates/positi...

Having never gone down this route before, I'm not sure which type I need. It is for a single name domain, for email authentication. Do I need Wild Card for that??

Thanks for the help!