External owa access

Can anyone clarify me on this.

I have exchange 2010 with edge, mbx and cas servers. Also have TMG

If my edge server is down, will it affect my external owa access for the users ?

Also, need to know wat are the functionality to check if the Edge server is down ?

Please suggest
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Kamalasekar ParthasarathyMessaging SupportAsked:
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dreamraghuCommented:
Yes, they will not be able to send and receive e-mails as the EDGE server is down(i hope the routing directly takes place with the edge server).

But still external users are able to open OWA.

You can use the monitoring tool to check the server status or if you are checking manually, you have to check the services and application log.
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teomcamCommented:
Ofcourse you will not have external mail traffic in and out. To check your edge server you may login to your TMG server and open the Exchange managament console and see whats going on. Make sure exchnage related services also running.

You may wanna look at this following treasure link, guarantee you'll love it.

Everything about OWA
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Kamalasekar ParthasarathyMessaging SupportAuthor Commented:
dreamraghu:

Thank you. please confirm one thing

But still external users are able to open OWA. how they will be able to access.. can you explain a bit briefly.

All my users emails goes out through only my Edge server. so if any one access owa from external. it will check the dns and it will contact my edge server right ?  please suggest
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Kamalasekar ParthasarathyMessaging SupportAuthor Commented:
teomcam:

I understand the email will not route through external but need to know how about the external Access for OWA.
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sumit_aroraCommented:
Emails getting delivered from outside to inside netowrk or Local users sending email to each other inside the network...etc are taken care By Hub and edge server (Edge server is being used to controll the spam etc)

CAS server is responsible for providing connectivity to owa, Activesync etc ..

So if edge server will go down users wont be able to see new emails but they can still see Old mails which has been delivered before Edge server went down.

I hope this expalins your queries
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teomcamCommented:
They can access OWA externally because edge server not responsible to provide IIS interface! To test it you may login your TMG server and stop exchange server servcies and see yourself. You can do this after hours or weekend.
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