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issue with exch 2010 and outlook 2003 and 2007

I have a DAG exch 2010 setup that has been in place for 1 year with 2 Mailbox server. I just added 2 more MB servers to the DAG, but they have no dbs on them as of yet. I am getting complaints from users with outlook 2003 and 2007 saying now that cannot connect, but outlook 2010 and 2013 users are ok.
The only roles on these 2 new MB servers I added is the Mailbox role..

There are also exch 2007 servers in this mix because we are in the process of migrating to 2010
Could this be an issue because of me adding the 2 new MB servers?
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vmich
Asked:
vmich
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1 Solution
 
chlebiTeam Leader IT InfrastructureCommented:
No, just ading two mailbox servers will not cause this. I guess you have some Autodiscover issue.
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vmichAuthor Commented:
That's what I thought and it looks like the cpu on one of the cas servers is running at 100% and there is a w3wp process which is the iis worker using it all up...
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vmichAuthor Commented:
chlebi,
the 2 new mailbox server don't have the certificate on them like the existing 2 mb servers do, would this be an issue?
The user keep getting prompted for their credentials when they try to get into outlook but it does not connect.
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chlebiTeam Leader IT InfrastructureCommented:
Sounds strange to me with the certificate - I cannot imagine why user who has no mailbox on this server would hit that and prompt for certificate. Noone should access this MBX server until having mailbox there.
You mention thet you are in process of migrating from 2007 - are you sure you did not do any change on your CAS boxes?
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vmichAuthor Commented:
No changes were made but there was an issue with some network stuff like switches and I am wondering if the 2010 cas servers may need to be rebooted?
What do you think?
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chlebiTeam Leader IT InfrastructureCommented:
Can't say, at least it does not hurt :)
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vmichAuthor Commented:
Issue was caused by a faulty 3750 switch causing communication issues with servers and the DAG
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vmichAuthor Commented:
faulty 3750 switch Cisco
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