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I dont believe outlook 2007 has a limit like outlook 2003 did. However one thing you might want to consider is that the larger the OST file the worse outlook will perform. A large OST file will cause slow opening and closing of outlook and may end up causing some instability. 
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I dont believe outlook 2007 has a limit like outlook 2003 did. However one thing you might want to consider is that the larger the OST file the worse outlook will perform. A large OST file will cause slow opening and closing of outlook and may end up causing some instability.

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For more info see the following link<br />
<a href="http://support.microsoft.com/kb/932086" rel="ugc nofollow">http://support.microsoft.com/kb/932086</a>
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For more info see the following link
http://support.microsoft.com/kb/932086 [http://support.microsoft.com/kb/932086]

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Is there a limit for the size of the OST file in Outlook 2007 Client?
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Is there a limit for the size of the OST file in Outlook 2007 Client?

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.