In a recent announcement in Message Center, Microsoft is letting customers know about upcoming changes to how Office 365 IP address and URL details are published.
You should not disable the Windows Firewall on Exchange servers.
Microsoft has published detailed information about Exchange Server 2013 network port requirements.
This tutorial demonstrates how to configure ISA Server 2006 publish POP3 and the alternate client mail submission port to allow Exchange 2010 mailbox access by remote email clients.
To quote Bruce Schneier, “well-designed security systems fail gracefully”. This means for example when the ISA firewall service fails it closes off network connectivity entirely (ie retains security) instead of opening your entire network up (ie decreases security). This week SonicWALL’s license servers suffered a glitch rendering thousands of customer units useless and leaving the […]