What are the risks of opening port 80 on an office Windows Server firewall?

I generally open port 443 on office firewalls to allow encrypted traffic through for remote access.  One web service, in order to communicate with a line of business application installed on the Windows Server requires port 80 (in addition to port 443) to be opened and I'm reluctant.  What are the risks of opening port 80 on an office network firewall? Is there a way to project the network if it is opened?
Thanks.
b1dupreeAsked:
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Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
Hi,

Any port you open always pose a security risk because you are opening more leway into in and out of your network. The more ports you open on your firewall the more you are at risks.

To give you a lever of protection you can configure your firewall to only accept traffics from and to a particular IP or subset of IP by that you know that the connection is coming from someone you trust...

regards
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b1dupreeAuthor Commented:
Thanks.
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