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    Outlook.com comes with OneDrive: free online storage for your files and photos. Learn more about what you can do with Outlook.com and OneDrive.
    When you synchronize your Exchange mailbox to an Offline Folder file (.ost), the Outlook status bar never shows higher than 3.99 GB when a folder is being updated. For example, you may see the following text in the status bar when your Inbox folder is...
    Describes how to rebuild the identity database to resolve various problems in Outlook.
    Describes an issue in which the file size limits of .pst and .ost files are larger in Outlook 2010 and Outlook 2013.
    Provides a description of the 4 GB RAM Tuning feature and the Physical Address Extension parameter.
    Explains how to configure the size limit for both .pst and .ost files in Outlook. The article lists four registry entries that you can use to limit the size of both the .pst and the .ost files.
    Microsoft Office Outlook 2007 and Microsoft Office Outlook 2003 have both a different format and a larger overall size limit for the personal folders (.pst) file than the .pst files that are in the earlier versions of Microsoft Outlook. In Outlook 2002...
    Describes how to troubleshoot performance issues in Outlook 2007.

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