Cannot send email with attachments - with a twist

I have a customer in an office setting.  The office provides free wireless access (secured) to its employees/contractors.

I procured and setup a new Dell desktop computer to replace an ailing Win2k pc.  The computer is new, and has Windows 7 32bit.  Since you can't run OE, I elected to install Thunderbird as the email client.  I setup the account per the provider's POP settings.

The issue is; I am able to send/receive emails and even receive emails with attachments but cannot send emails with attachments (I should say attachments of about 10kb I can send).

Attempted remedies:
-Setup the same POP account settings in Outlook 2007 - same result
-Uninstalled all security software on the client's computer - same result with Thunderbird and Outlook 07
-Setup up the customer's account on my computer (Win7 64bit) in Outlook 2007 - same result
-Setup the customer's account on a virtual XP computer - I can send attachments without any issues.
-Restarted the old Win2k computer and attempted to send an email with attachment (+/-1MB) – this was successful
-Verified the settings in the OE in old Win2k computer matched the new computer

What is holding this back?
PAMurilloAsked:
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Tiras25Commented:
Might have installed antivirus scanning large attachments.  Might consider disabling that function temporarily if that's what's happening.
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PAMurilloAuthor Commented:
I completely uninstall all security software with the same results
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Tiras25Commented:
Are you getting any sort of error message? Is it a timeout message?

Try this: Increase mailnews.tcptimeout from its default value of 60 seconds to 300 seconds using Tools -> Options -> Advanced -> General -> Connection timeout. This frequently solves the problem, especially when you have a wireless connection.

BTW, OE is replaced with Live Mail in 7 its not bad, try it.
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PAMurilloAuthor Commented:
Yes, it times out.  I have changed the time out settings for both Thunderbird & Outlook and got the same result.

I am sure the issue is not with the email client software - more with Win7.  Please review the facts and remedies I stated in my original question.
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PAMurilloAuthor Commented:
Let me add that all current updates are installed in Win7.
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1209ylCommented:
It may be an extensions issue with Win 7. Try adding the .bak extension before you send the file, and then the .bak extension will have to be removed when received.

Side point: What version of Thunderbird? I think 3.0 has Win 7 bug issues.
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PAMurilloAuthor Commented:
Hi 1209,
I will try the .bak suggestion, but it would seem impractical for my client to rename every attachment.

Also, the TB version is 3.0, but the same problem happens with Outlook 2007.

The network upload speed is very slow at my client's office.  I have no problems when I take my laptop with my client's POP account settings and send attachments on other networks.

Again, when I use my client's POP account on a Win2k or WinXP computer at their office, it works without any issues.
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1209ylCommented:
Maybe try this:

Try creating a new profile in outlook and then check. The link below gives information on how to create a new profile.

http://support.microsoft.com/kb/829918

 

Note: Email account has to be created in the new profile before you could try sending/receiving mails.

 

 

If this fails then restart your computer in clean boot mode to check if there is any non-Microsoft service interfering while sending attachments.

http://support.microsoft.com/kb/929135

 

Note: Please follow Step 7 in the link above to restart the computer in normal mode.

Source: http://social.answers.microsoft.com/Forums/en-US/outlooksend/thread/82504a09-0386-4425-b96a-d4e42cc2f571
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PAMurilloAuthor Commented:
-I tried the Clean Boot & new profile (I am familiar with this) - same result
-Starting in Safe Mode with Networking - same result

I tested the download using http://speedtest.texas.rr.com/ and got an upload speed of <.1MB

There is obviously a bandwidth issue, but at the same time I think we can conclude that Windows 7 handles email transmissions differently than XP & even Win2k since I am still successful in sending attachments with these two OSs.

Any suggestions?
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1209ylCommented:
I would try looking through your Win7 Network settings, maybe you have a setting on that limits bandwidth.
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PAMurilloAuthor Commented:
I am starting to think is is something in the router or managed switch (If there is a managed switch).  The IT manager for the facilities is on-site today investigating this issue (others have reported the same symptoms with their Win7 computers).
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1209ylCommented:
Hope all goes well.
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PAMurilloAuthor Commented:
The IT tech apparently did a firmware update and it worked.  I wasn't there so I don't know the make/model, but it was 5 years old.
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