OWA Slow or Dies from Wan, fine on Lan.

We have a Win2k3 Server acting as DC and Exchange 2003 server for 25 users.  We've been using OWA exclusively in the office for a month now with good results.  I've opened up port 80 (and 443 for SSL to be implemented later) for testing and using the site is excruciatingly slow from high speed connections (tested 3 different outside connections).  I notice that if I log into OWA remotely, it does ok until I do something (like send an e-mail).  If I then click on 'Inbox'  The middle pane says 'Loading' and remains like that (for 30mins anyway after which time I gave up).  I've read all the other slow OWA threads but to no avail.  Most slowness problems seem to involve SSL, which we haven't installed yet.  I've done the certificate request in IIS, but haven't installed it yet.  Any suggestions?

Edit: If I get stuck on the inbox 'loading' and then close IE, log in again everything is fine (loads ok) until I do it again.
BasilFawlty001Asked:
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jaguarpriestCommented:
are you don'g Http://domain.com/exchange or https://domain.com/exchange (secure) .
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BasilFawlty001Author Commented:
Right now just Http.  I've generated the request from IIS but haven't actually installed the certificate yet.  I read that SSL can really slow down OWA so I wanted to make sure that OWA was quick enough before adding SSL.  It isn't at the moment.

I just took a look at the computer having problems connecting and it looks like IE is way out of date on that machine.  The inbox hanging issue seems like it might be related to that.  That doesn't explain the general slowness though.  Users mention that deleting an email for example can take 30 seconds or so.  OWA freezes up during that time but it eventually works.
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jaguarpriestCommented:
1. is this from any machine?  or isolated to one machine
2. What is YOUR upload speed. you may be hosted on a kick as download, but the upload is what will provide the OWA service. is you ISP business or residential

3. How about OWA from within the network or the actuall server. If you OWA inside the server/network is it fast or slow. It should be instant right? if it's slow, something is wrong with the server setup (permissions, possible hardware issues, etc) . if it rocks then something is wrong with the connection or packets are being dropped. What kind of firewall/router are u using.

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BasilFawlty001Author Commented:
1.  This is from all (or at least most) machines.
2. U/L is 200kB/s.  We have 2 ISP's.  One DSL and one Cable.  The url for the exchange server goes through the Cable connection which has the faster u/l of the 2 (200kB/s).
3.  Inside is perfect ... instant.  We're using a symantec 360R Load balancing firewall.  

Are there speed issues with different versions of IE?

I don't think it's upload speed, because I can remote into work and control the computers at a very reasonable speed.
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jaguarpriestCommented:
perhaps , but the overhead on Terminal service or a remote control tool (laplink, etc..) is less than OWA packets. Is it different with OWA in premium or standard mode. 200Kbs is not that fast either. I mean it works, but it's not a full 1/2 megabit up, not even a quarter Megabit upstream.

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BasilFawlty001Author Commented:
@jaguarpriest:  do you know what sort of bandwidth we would need per premium connection?  I can't seem to find that listed anywhere.
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BasilFawlty001Author Commented:
I just did a bandwith test and we're actually getting over 500kb/s upload in the middle of the day, so that's not too bad.
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jaguarpriestCommented:
That's pretty good speed actually. Have you applied the latest service pack?

http://www.sbslinks.com/exchange.htm

Check this link out if you wish. Step by step instructions.

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BasilFawlty001Author Commented:
Yes I have.  It actually came with SP1.  I have since installed SSL and now speed seems fine.  That makes no sense I realise but for me the issue is resolved.  Thanks for all your help, and I'm sorry we couldn't figure it out together.
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