Article ID: 2759052 - View products that this article applies to.
If you have a large Microsoft Outlook data file in your profile, you may experience application pauses. The larger the data file, the more application pauses you may experience.
Note Outlook data files may be either personal folders (.pst) files or offline folder (.ost) files.
This problem occurs when the size of your Outlook data file is 10 gigabytes (GB) or more.
To resolve this problem, reduce the size of your Outlook data file by moving or archiving items from the file.
You may also consider using synchronization filters for Cached Mode profiles to reduce your .ost file size. The following blog post describes how to reduce the size of your local data file by using synchronization filters. (This post applies to Outlook 2007 and later versions.)
Optimizing Outlook 2007 Cache Mode Performance for a Very Large Mailbox
This is a stopgap solution and is provided here for reference if you cannot reduce the size of your mailbox. For example, you may be unable to reduce the size of your mailbox if you have to maintain an archive of all sent and received email messages over a span of several years.
Outlook 2013For Outlook 2013, you can also try to use the new Sync Slider feature for Cached Mode profiles. This feature lets you control how many months of email messages are synchronized with your .ost file. For more information about the Sync Slider feature, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/2733062/ )Only a subset of your Exchange mailbox items are synchronized in Outlook 2013
If you have a large .pst or .ost file, you may experience application pauses while you perform typical operations in Outlook. These typical operations include reading email messages, moving email messages, and deleting email messages.
The following list summarizes expected behavior based on the size of your Outlook data file.
(http://support.microsoft.com/kb/2695805/ )How to troubleshoot performance issues in Outlook 2010
(http://support.microsoft.com/kb/940226/ )How to troubleshoot performance issues in Outlook 2007
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