If you are using Intuit's Quickbooks accounting software and the email client Microsoft Outlook you might like the Improve Email addin for Microsoft Outlook that provides the option to email Quickbook customers from within Microsoft Outlook. The addin for Microsoft Outlook is currently available for free on the developers homepage. Just email the developer for a product key which usually would cost $49.
The addin adds a new Quickbooks Contacts button to Microsoft Outlook that can be used to pick a customer from the list of available Quickbooks contacts. This makes it a lot easier to email those customers right away without having to switch to Quickbooks to find the email address.
The addin works with Outlook 2000, Outlook XP, Outlook 2003, and Outlook 2007 and basically any version of Quickbooks since 2003 including the latest QuickBooks 2009.
Update: The developer website is no longer available. We have removed the link from the article as there is no point in keeping it attached to it. The add-in for Outlook too can't be found anywhere anymore on the Internet.
What you can do is head over to the Intuit Marketplace to check out some of the offerings there. While I can't guarantee that you will find a comparable add-in for Microsoft Outlook, let alone a free one, you may find a program suitable for your needs that you may want to install on your system.
You can try the search of the marketplace to find programs there that are available for the Outlook software.
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