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I am looking to host microsoft exchange on our local server which has windows server 2008 r2 installed.

My concern is that our upload speed provided by our internet provider is rubbish. I just did a with 6Mbps download & 0.13Mbps upload.

Is the bad upload speed going to effect our users when emailing compared to our old pop3 hosted email accounts?

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up vote 3 down vote accepted

Assuming that your users are local to your Exchange server, they won't directly notice anything. If you send an email in Outlook, it'll go into their Sent Items folder almost instantly. Where it will have an impact is on the Exchange server delivering the emails to their destinations. Depending on what sort of volumes you experience, the uplink may be an issue if your users are sending more email than the uplink can deliver timeously. This will cause your queue to grow, leading to delays in email delivery.

In addition, you must bear in mind that a saturated uplink will also impact your downlink. Even if you are mostly downloading data, IP packets are being sent constantly, especially when you're dealing with TCP applications such as HTTP, because the client doing the downloading is also sending packets to the server all the time to acknowledge receipt of each TCP packet.

So essentially if you saturate your uplink it's possible that your connection can become unbearably slow before you even get close to saturating the 6Mbps downlink.

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Also, if you have any users outside your network using OWA, their webmail experience will be affected too. – adamo Mar 4 '12 at 8:09
+1 Thanks Graeme & @adamo, your answer really helped, we don't currently have huge volumes so I'm not too concerned about the saturating the upload. However I am concerned about our users when they are outside the office or working remotely. If they are downloading reasonable size emails, say up to 10mb, I presume it is going to be a lot slower for them to download their email? – Reafidy Mar 4 '12 at 11:13
Correct, and everything I said about saturating the uplink will definitely come into play in that situation as well. – ThatGraemeGuy Mar 4 '12 at 12:20

when emailing compared to our old pop3 hosted email accounts?

No, HOW COULD IT? The situation is just better - incoming email via SMTP, outgoing was SMTP always. Nothing really has changed but you store emails locally.

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+1 Thanks TomTom, as In my comment above to Graeme, I'm concerned about users working remotely and downloading their email from the slow server as a posed to our current hosted server. I'm not sure if this will be an issue or not. – Reafidy Mar 4 '12 at 11:15
You ahve to try it out. One thing to remember is that Outlook (not owa) is very hiding. Outlook works from a local copy ANYWAY - and whether the email takes 5 or 50 seconds until it arrives at the client makes ZERO difference normally. – TomTom Mar 4 '12 at 11:17

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