Mac computers in the office are not able to connect to our exchange server.

We started facing this problem about a month ago in our office where the apple computers can not connect to the exchange server via outlook or applemail or anything for that matter. All the other computers can connect to the exchange server with no problems
and the apple computers can even access the exchange server via OWA but the outlook and applemail apps would not connect to exchange. We have tried even deleting and re-creating some accounts on the apps but they still would not connect. At this point I am
at a complete loss and I looked everywhere through google to find out if anyone else has faced this problem but to no avail.
A little background information. This specific problem started happening after there was an un-expected series of power outages to the servers and they were shut down un-expectedly. I personally restored the servers and turned on all the services and made
sure everything was up and running after the power outages and everything was working fine. Also the first instance of the problem with the mac computers only happened two days after the servers were back up and running again and they had no issues in those
two days.
Right now we do not have that many mac users in our offices (only 3-4 users) and I have instructed them to use the OWA in the meanwhile but it is however an inconvenience to them. By now you may have realized that I am not a very experienced server admin
and I would really really appreciate any help. I extend my thanks in advance for any insight.

Hi Martin,
Thanks for the reply.
Right now I have Apple mail and Outlook installed on my mac laptop and both the applications do not connect to the exchange server. Apple Mail simply does a long process when I give my credentials to create my account and then it gives an error saying it
could not find the server while outlook quickly tells me that either the username or password is incorrect. At the same time I can connect to the server through outlook on my windows computer without any problems whatsoever.
From your reply, I gather that the VIA headers only affect Apple mail and should not affect Outlook app on the mac but right now, neither apps are connecting to the exchange server.
Either way I am trying to find out how to remove the VIA headers because it does not seem that we are using Kemp on the exchange server. Right now I do not have the in depth knowledge that I need because I was not involved in the implementation of our server
system, that was taken care of by a service provider and I was put in charge of mostly simple admin work. Now we are out of contract with the service provider so pretty much everything has fallen onto my shoulders.
If possible, would you mind pointing me in the right direction to finding out if I am using a L7 load balancer and how I would go about removing the VIA headers?

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