My new Airport Extreme will not allow access to a Microsoft Exchange server

I just installed a new Airport Extreme at home and now I cannot access my work e-mail which is on a Microsoft Exchange Server.  If I go back to my old wi-fi Access Point my work e-mail comes in and out with no problems, but when I hook the Airport Extreme it keep saying the connection is bad and to check the e-mail username and password.

If you setup the AE wrongly, as a router when you already have a router, then you must bridge the AE. Apple nowadays reckon they should be top dog and force the AE to router mode.. unfortunately this is wrong on at least 50% of the setups and their support says double NAT doesn't matter.. well it does matter.
You can do a simple test.. traceroute 8.8.8.8 from terminal or network utility.
If you find two separate private IP addresses the AE is setup wrongly and it must go to bridge mode.
Eg.. here is mine.. you will note there is hop 1, the main router.. 192.168.2.254 and the next hop is internet IP.
What you want to avoid is 10.0.1.1 and then 192.168.1.1 or any other combo of private IP addresses.
If the AE is setup correctly and there is only a single private IP in the traceroute then you have a different issue.
The AE is blocking the ports required for you to access your mail.
You will need to setup manual port forwarding to get this working. There is no firmware fix as this issue is in every firmware for the AC version AFAIK, but certainly if you are trying on previous firmware check for upgrade.
Port forwarding check what ports are required..
https://support.microsoft.com/kb/176466/EN-US
And folllow the instructions to open them.
https://discussions.apple.com/docs/DOC-3415

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