Outlook with Exchange connection issues

I am implementing a security policy which includes blocking all outbound traffic on the firewall of our network (Except normal 80, 443 etc). It seems
that if I apply this, some users aren't able to connect to exchange. This appears to be related to Outlook Anywhere. What ports would I need to allow to prevent this connection issue?

Hi
As per the information and details provided by you, to solve the Outlook with Exchange connection issues, Please follow these steps: -
Microsoft introduced
RPC over HHTP as a better way for Outlook client to connect to Exchange. The MAPI connections still use RPCs, but they encapsulate those with an HTTP connection. Since that HTTP connection is secured using SSL, it is may be
more accurate to call it RPC over HTTPS. These connections only require connectivity
over TCP port 443, which as you know is assigned to HTTPS and is normally open by
firewall admin for web servers.
Outlook Anywhere wraps
Remote Procedure Calls inside an HTTP layer to allow connectivity with the Exchange server. This simplifies the firewall administration process requiring only
the SSL port 443 to be opened to the CAS (Client Access Server) instead of several ports to the actual Mailbox Server (MBX).
I hope this information will be helpful for you.
Thanks and regards
Shweta@G 

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