Note the size of the OST file for the user’s Outlook profile.Windows XP: %userprofile%\Local Settings\Application Data\Microsoft\Outlook.Windows 7 or Windows Vista: %userprofile%\AppData\Local\Microsoft\Outlook.Open the Outlook system folder by opening the following folder path, depending on the operating system:.Click Folder Size, and then note the Total size value on the Local Data tab.In Outlook, right-click the mailbox in the navigation pane, and then click Properties.A large OST file may indicate corruption or fragmentation of the file. Make sure that offline OST file in Outlook isn't too large. Use the procedure in this article as a baseline to make sure that the client downloads the correct OAB. How to troubleshoot the Outlook Offline Address Book in an Office 365 environment If Outlook is using the OAB, you can help troubleshoot the issue by following the steps that are described in the following Microsoft Knowledge Base article: If the path of the OAB file on the computer is listed, Outlook is using the OAB, and the Outlook slowness isn't caused by OAB issues. If the fully qualified domain name (FQDN) of a server is listed, Outlook is using the online GAL. To determine whether this is the issue, right-click the GAL, and then click Properties. By default, if Outlook can't access the OAB, it uses the online GAL. Determine whether Outlook is directly using a Microsoft Online global catalog (GC) server for online global address list (GAL) lookups.In the Choose address book area, make sure that \Offline Global Address List is listed as an option.In Outlook 2007, click Tools, click Send/Receive Settings, and then click Download Address Book.In Outlook 2013 or Outlook 2010, in the Office Ribbon, click Send/Receive, click Send/Receive Groups in the Send & Receive group, and then click Download Address Book.Make sure that you can download the Offline Address Book (OAB). Method 2: Download the Offline Address Book
In the E-mail Settings window, select the user's Exchange Server account, click Change, and then make sure that the Use Cached Exchange Mode check box is selected.Click the Tools menu, and then click Account Settings.On the E-mail tab, select the user's Exchange Server account, click Change, and then make sure that the Use Cached Exchange Mode check box is selected.Click the File tab, click Account Settings, and then click Account Settings.To do this, follow these steps, depending on the version of Outlook that you are using: You can try to improve performance by making sure that Cached Exchange Mode is enabled. Why performance of Microsoft Outlook email client is slow in the Office 365 environment? 12 Methods to resolve this issue.
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