Securing webmail - changing a port necessary to ensure security?

["Jennifer Fountain" <jfountain () rbinc com>]

I am going back and forth on this one with a consultant on this one and
need an expert opinion.  So, I turn to you :)  When configuring webemail
(such as owa) that is using https, is it better to change the default
port (443) to an uncommon port (20000)for security reasons?  Does it
secure it further by doing this?  Wouldn't it cause more issues than
anything if you try to access that site from inside an org that only
allows port 80/443 and 21 out?  

Thank you in advance for any opinions you may share.

Kind Regards,

Jennifer Fountain

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