If you have a virus scanner that integrates with Outlook, disable this
integration and try again.

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
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> Since I started using Outlook 2007 my mail messages with attachments (even
> 100 kB in size) take up to 10 mins to leave. If the size of the attachment
[quoted text clipped - 7 lines]
> Outlook?
> Thanks a lot.