Look for these files at the following locations in Windows XP or Windows 7 & Vista:

Outcmd.dat: WinXP: %USERPROFILE%\Application Data\Microsoft\Outlook

Windows 7 and 8: C:\Users\<username>\AppData\Roaming\Microsoft\Outlook

Type or paste this shortcut in the address bar of Windows Explorer then press Enter to jump to the folder in either OS:

%USERPROFILE%\Local Settings\Application Data\Microsoft\Outlook

Extend.dat:Windows XP: C:\Documents and Settings\<username>\Application Data\Microsoft\OutlookShortcut to Extend.dat on Windows XP:C:\Documents and Settings\<username>\Local Settings\Application Data\Microsoft\Outlook

Windows 7 and 8: C:\Users\<username>\AppData\Local\Microsoft\OutlookShortcut to Extend.dat on Windows 7/8:%localappdata%\Microsoft\Outlook

Frmcache.dat: Windows XP: C:\Documents and Settings\<username>\Application Data\Microsoft\Outlook

Shortcut to Frmcache.dat on Windows XP:%USERPROFILE%\Application Data\Microsoft\Outlook

Windows 7 and 8: C:\Users\<username>\AppData\Local\Microsoft\FORMSShortcut to Frmcache.dat on Windows 7/8:%localappdata%\Microsoft\Forms

Views.dat:Windows XP: C:\Documents and Settings\<username>\Application Data\Microsoft\Outlook

Shortcut to Views.dat on Windows XP:%USERPROFILE%\Application Data\Microsoft\Outlook

Windows 7 and 8: C:\Users\<username>\AppData\Local\Microsoft\OutlookShortcut to Views.dat on Windows 7/8:%localappdata%\Microsoft\Outlook

Solution 2:

Create a new PST. Although the Outlook 2007 PST is essentially identical to the PST format new to Outlook 2003,Outlook 2007 writes additional data to the PST.

If this fixes the problem, import or move your items from your old PST to the new one.

Solution 3:

Create a new profile. No need to delete the old profile just yet, just make a new one to see if the problem is fixed.

If this fixes the problem, you can delete the old profile.

Solution 4:

Disable Outlook Setup Add-in (Instant Office add-in by Cyberlink) on Dell computers that have Media Direct installed. This add-in is responsible for converting meeting requests to recurring meetings and creating calendar and contact folders when saving attachments. It also slows Outlook down.

Go to Tools, Trust Center, Addins and locate the add-in. At the bottom of the screen, select Manage: COM add-ins and click Go. Remove the checkmark from the Cyberlink add-in and close the dialog.

Solution 5:

Uninstall Business Contact Manager

More Information

The update described in KB933493: Description of the update for Outlook 2007: April 13, 2007 appears to help with many performance issues in Outlook 2007.Outlook and Slow HTML – this relates to slow typing in HTML message.Recurring Meeting Bug – affects Dell Laptops with Media DirectHelp! My Email opens slow – for older versions of Outlook

Disable Useless Outlook Add-ins

Yes, they are useless, except for one maybe. In order to disable all of the add-ons that are active by default, you’ll need to open Outlook 2007 in Administrative mode.

First, go to C:\Programs\Microsoft Office\Office12, right click on the Outlook.exe program and choose “Run as Administrator”.

Then, once Outlook loads, go to Tools from the top menu and then Trust Center.

Click on Add-ins in the left hand menu and then click on the Go button at the very bottom of the dialog where it says Manage and has a drop down box.

Now you’ll get a list of add-ins that you can uncheck. I suggest you un-check ALL of the add-ins except for Windows Indexing.

Go ahead and choose the other option in the drop-down box, which is Exchange Client Extensions. Do not disable the Exchange add-ins if you’re connected to a corporate network.

This one change significantly increased the speed of my Outlook 2007 installation. It also helped to reduce the number of instances of loading dataset.

2. Disable RSS feeds in Outlook 2007

Another annoying default feature in Outlook 2007 is the large number of RSS feeds that come pre-configured and that eat up resources in due to synchronization. Outlook will keep checking for updates to these feeds and therefore slow things down considerably. If you use another reader for your RSS feeds, like Google Reader, make sure to remove the RSS feeds from Outlook 2007.

In Outlook 2007, go to Tools, Account Settings and then click on RSS Feeds.

As you can see, I’ve removed all of my RSS feeds so that no CPU power is being used up for this purpose! Just click the remove button for each RSS feed listed.

3. Compact your Outlook.pst personal folder

One other thing you can do to speed up Outlook 2007 is the compact your email folders so that they are not as large. It’s best to delete out any emails with large attachments or even to archive some emails if your file is larger than 1GB.

In Outlook 2007, click on File and then Data File Management.

Click on the Data Files tab and then double-click on the data file that you wan to compact.

Now go ahead and click on the Compact Now button to reduce the size of the personal folder file.

That’s all of the methods I could figure out