Outlook 2010 strange characters in sent mail

I have a user that had a new workstation installed yesterday. Office 2010 loaded. Connects to SBS 2003 server (with exchange).
Now when users sends an email, extra characters are added. For example:

> ------_=_NextPart_002_01D10661.9DC436F2
> Content-Type: text/plain;
>    charset="us-ascii"
> Content-Transfer-Encoding: quoted-printable

> Hi =20

> =20

> I sent you some samples yesterday of the stuff I am doing .. you may
> want to amend change etc..=20

> =20


What is causing this?
jad2009Asked:
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A. Cristian CsikiSenior System AdministratorCommented:
An Antivirus maybe. Try disabling any antivirus on exchange server and check again.

Cristian
Scott CSenior EngineerCommented:
Is this happening to one user or multiple users.  From your description it's not clear.

If it's one users have them try to send from OWA and see what happens.  Also have that one person (if it is just one person) log onto another machine and try to send an email.

Does the issue follow the user?  Have another users log onto the machine showing the problem and see if the issue stays with one particular machine.

If it stays with one machine, look at Outlook for add-ins and start Outlook in Safe Mode and test again.

Could be an add-in issue.  Also look for any new software installed or anything that looks out of place.
Jason CrawfordTransport NinjaCommented:
In Outlook, have the sender change the message format to HTML or plain text:

https://support.office.com/en-us/article/Change-the-message-format-to-HTML-Rich-Text-or-plain-text-d92bba10-7ed4-4413-a031-7a1559112d90

This is a content conversion issue so we'll have to determine where and how it's being converted.

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