exchange server 2007

I am running exchange server 2007 on a windows 2008 server.
I have installed the latest service packs for the exchange server 2007 and the server 2008

Can someone PLEASE PLEASE explain to me why accessing email using the internal network and OWA (Web Access) works ok, but using Outlook (2007) is very very slow to synchronise (can take hours)
I have been on this for months and have had so-called experts looking at the system also. I am assuming that it is a network issue but cannot find the fault(s) anywhere.

Has anyone got any ideas on this - it is proving extremely difficult to solve
Thanks,
doctorbillTechAsked:
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vishalvasuCommented:
Are you running any anti-virus software on the client machines? What is the size of the PST file if the emails are being archived and is it being loaded when Outlook starts? Are you running any Outlook Add-Ins?

Also, you might want to check out this article: http://support.microsoft.com/kb/933493
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morpheiosCommented:
Dont use cache mode in Outlook - it will work fast.
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doctorbillTechAuthor Commented:
tried that - no solution
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doctorbillTechAuthor Commented:
To save time on this:
I (and so called experts) have tried ALL obvious fixes with no result.
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KaffiendCommented:
Did you look at disabling encryption between the client and Exchange?

(BTW, I hope you meant to say you are running Windows 2008R2, and not Windows 2008)
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doctorbillTechAuthor Commented:
It is a microsoft windows server 2008 standard FE , version 6.0.6002 service pack 2 build 6002

Yes - I have tried disabling the encryption with no success
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kkareemCommented:
please check the Queue on hub transport server and if status against Queud mail is "server is too busy or something else"
than do the following on your mailbox server:
check your Ram weathet iis it enough or not to existing configuration?
Check your Virtual memory settings weather is it right according to existing Ram?

hope it will solve your problem:)
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doctorbillTechAuthor Commented:
Queued mail is fine - no messages backed up
RAM is 8 gb, but 7.5 gb is currently allocated / used. This, I understand, is normal for a server running exchange / sqlserver etc. Available virtual memory is 12 gb
antivirus is sophos - this has not changed in months
pst files (or rather ost files) have recently been compacted and archived. The ost files are running at about 2 gb
no outlook addins are currently being used
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kkareemCommented:
please configure pop account and check weather will it worki fine.
and also checck you NIC driver updates it is possible that root cause is network performanece.
:)
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kkareemCommented:
http://blogs.technet.com/b/exchange/archive/2007/07/18/3403490.aspx
also read the above link it may help you to resolve problem
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doctorbillTechAuthor Commented:
I will check these possible fixes out - the network card did cross my mind
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doctorbillTechAuthor Commented:
One thought - it it was a network card issue, would that not affect the exchange web access as well - this is working ok
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kkareemCommented:
do one things:
install outlook on mailbox and configure MAPI ,it will resolve your ambiguity regarding NIC.
:)
Regards
K

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doctorbillTechAuthor Commented:
Still not solved
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