I have run into this several times recently and almost every time, there is a different cause.
The current situation happened at a customer where one user could not promote any emails into CRM, either from customer contacts or other CRM users.
Digging around a bit, I found this newsgroup thread with a mention of the following KB Article:
This particular article lists two possible causes:
• The forms cache in Microsoft Outlook is corrupted.
• The Microsoft Outlook temporary folder contains too many files. By design, Outlook has a limitation of 99 duplicated names that can be saved to the same image. Therefore, Outlook cannot read the embedded image when you have more than 100 e-mail messages with the same image.
In my particular case, the solution was to delete Outlook's temporary Internet files.
Thanks to Guy Shokrani for posting the solution on the newsgroup.
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[...] By mitch 933234: Error message when you try to track an HTML-formatted e-mail message that contains an image in the signature in Microsoft Dynamics CRM 3.0: "An error occurred promoting this item to Microsoft CRM" … http://blogs.infinite-x.net/2007/12/11/an-error-occurred-promoting-this-item-to-microsoft-crm/ Mitch Milam's Microsoft Discussions http://blogs.infinite-x.net [...]
[...] By mitch 933234: Error message when you try to track an HTML-formatted e-mail message that contains an image in the signature in Microsoft Dynamics CRM 3.0: "An error occurred promoting this item to Microsoft CRM" … http://blogs.infinite-x.net/2007/12/11/an-error-occurred-promoting-this-item-to-microsoft-crm/ Mitch Milam's Microsoft Discussions http://blogs.infinite-x.net [...]
[...] By mitch 933234: Error message when you try to track an HTML-formatted e-mail message that contains an image in the signature in Microsoft Dynamics CRM 3.0: "An error occurred promoting this item to Microsoft CRM" … http://blogs.infinite-x.net/2007/12/11/an-error-occurred-promoting-this-item-to-microsoft-crm/ Mitch Milam's Microsoft Discussions http://blogs.infinite-x.net [...]
Is roll-up 2 installed?
This article of KB reports the problem: http://support.microsoft.com/kb/925532/en-us
See if there is your solution:
http://www.microsoft.com/downloads/details.aspx?FamilyID=D5B1FBBE-DFC2-4A33-B5FD-CAE99E8E9DAB&displaylang=en