As reported in multiple blogs and user forums, the SMTP component had an issue about locking the files that was attached to sent emails. This usually always caused issues, as you would clean up your temporarily generated files after having sent them with the email attachment.
According to the released hotfix KB2280492, this was occurred occurs because Microsoft .NET Framework waits for the garbage collector to release resources when .NET COM objects are retained in memory.
Curious as most i looked into the fix they released to see what was actually changed, as it uses some standard .NET components to send the emails with.
Most of your hardcore blog-readers probably already have this link in your bookmarks, but for the pleasure of those that dont, i want to redirect you to this page of “NEXT = 0″ author 
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Just a quick post here serving as shortcut for implementing Microsoft Navision Mail.SmtpMessage in older databases. All it requires is these objects:
I got a Google Alert today with some interesting news from MSDN. They are doing “How do I?” videos. They are meant to show you step-by-step instructions for Microsoft Products and Technologies.
