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Did you open it via Shortcut?<br />
How many Outlook icon are on the bottom task pane?
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seen that before. have you tried to right click and close one of the windows down. and then restart.<br />
<br />
read the topic below:<br />
<br />
<a href="http://www.office-outlook.com/outlook-forum/index.php/m/389440/" rel="ugc">http://www.office-outlook.com/outlook-forum/index.php/m/389440/</a>
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jsut give a try to some of the below steps and it may surely solve the issue.<br />
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1&gt; Have u tried to reboot your machine and checked ?<br />
2&gt; If still then open Windows Task Manager --&gt; Go to Processes Tab ---&gt; in that search for Image NAme &quot;Outlook.EXE&quot; right click and end process tree. --&gt; Reboot the Machine and try it now<br />

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Thank you for all your replies.<br />
Your solution, Ahmed786, solved the problem, thank you. &nbsp;Can you please explain how the situation arose in the first place and what is the 'tree'?
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I have tried all of these options. &nbsp;I still have the problem of Outlook opening twice. &nbsp;I have decided to make this useful, I use the second one as my calendar, but it would be nice to have some controll over this issue.
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When I open Outlook 2007 in my Windows 7 computer it opens twice. &nbsp;This has only just started to happen but now happens every time.<br />
Can someone please help?
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When I open Outlook 2007 in my Windows 7 computer it opens twice.  This has only just started to happen but now happens every time.
Can someone please help?

Why does Outlook open twice?

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.