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You could try Microsoft Fit it <a href="http://go.microsoft.com/?linkid=9815935" rel="ugc">http://go.microsoft.com/?linkid=9815935</a><br />
<br />
Refer to <a href="http://support.microsoft.com/kb/2739501" rel="ugc">http://support.microsoft.com/kb/2739501</a>
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You could try Microsoft Fit it http://go.microsoft.com/?linkid=9815935 [http://go.microsoft.com/?linkid=9815935]

Refer to http://support.microsoft.com/kb/2739501 [http://support.microsoft.com/kb/2739501]

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Hello<br />
Does this meet your errors?<br />
<a href="https://support.microsoft.com/kb/2464597" rel="ugc nofollow">https://support.microsoft.com/kb/2464597</a>
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Hello
Does this meet your errors?
https://support.microsoft.com/kb/2464597 [https://support.microsoft.com/kb/2464597]

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Hi!<br />
One of our customer got a problem with their CRM program after upgrading to Office 2013 and then downgrading to Office 2010. A button to open the Outlook client doesn’t work anymore. <br />
When I use Sysinternals Process Monitor I can see that the program successfully locate the default mail client. But It tries to open wrong registry key. It should use 14.0 but use 15.0 instead. Does anyone know how to remove all references to the 2013 version of Outlook (15.0)? And yes I uninstalled Office 2013 before installing 2010.<br />
See attached image.<br />
<a href="https://filedb.experts-exchange.com/incoming/2013/12_w50/691944/office.png" target="_blank" class="file-inline" title="Process Monitor screenshot (44 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>office.png</a>
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office.png

Hi!
One of our customer got a problem with their CRM program after upgrading to Office 2013 and then downgrading to Office 2010. A button to open the Outlook client doesn’t work anymore. 
When I use Sysinternals Process Monitor I can see that the program successfully locate the default mail client. But It tries to open wrong registry key. It should use 14.0 but use 15.0 instead. Does anyone know how to remove all references to the 2013 version of Outlook (15.0)? And yes I uninstalled Office 2013 before installing 2010.
See attached image.

Office downgrade problem

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.