Question : Exchange HTTP Proxy Issue

I am running Exchange 2003 w/ SP2 on an SBS 2003 Server.  I have VPN's from most of the home offices but when Outside of the LAN or a VPN I am having an issue with Exhchange and Outlook.  When setting up an exchange account on a PC, using Outlook 2003 or 2007, and using the 'Connect to Microsoft Exchange ussing HTTP' option I get the followinf error because we have not urchased a certificate from a certificate authority.  I really would like to avoid this purchase if possible.

Error:
There is a problem with te proxy server's security certificate.  The security certificate is not from a trusted certificate autority.

Outlook is unable to connect to the proxxy server www.whatever.com.  (Error Code 8).

I have the following options set on the 'Microsoft Exchange Proxy Settings Tab'...
https://www.whatever.com
Connect using SSL Only (Greyed out)
On fast networks connect using HTTP first then connect using TCP/IP - ticked
On slow networks connect using HTTP first then connect using TCP/IP - ticked
Basic Authentication

Any help would be greatly appreciated, thanks so much :)

Answer : Exchange HTTP Proxy Issue

If you look at Verisign/Entrust etc.
I personally feel the Verisign certificates are a rip off - 40 bit certificates. Oh so you get insurance... big deal.

There are lots of suppliers at the low end of the market.
RapidSSL sell theirs for US$60 a year, less if you look around for a reseller.
InstantSSL are a similar price.
GoDaddy do theirs for US$20. Little more fiddly to install, but only adds a few minutes as long as you do it correctly.

RapidSSL have a 30 day trial certificate which can be a good thing to do to get used to the process.
GoDaddy certificates are compatible with Windows Mobile 5.0 with MSFP, as are InstantSSL.

URLS:

RapidSSL: http://www.rapidssl.com/
GoDaddy: http://www.domainsforexchange.net/
InstantSSL: http://www.instantssl.com/

Simon.