To resolve this problem, follow these steps in the order in
which they are presented.
Part 1: Create a New Profile
NOTE: Because there are several versions of Microsoft Windows, the
following steps may be different on your computer. If they are, see your
product documentation to complete these
Click Start, and then click Control Panel.
If you are not in Classic view, click Switch to
Classic View, and then click Mail.
Click Show Profiles.
Click to select the Prompt for a profile to be
used check box.
In the Profile Name box, type a descriptive name for the new profile, and then click OK.
Click Add a new e-mail account, and then
Click the appropriate server type for your new e-mail
account, and then click Next.
Follow the on-screen instructions, and then click Finish.
NOTE: Make sure that you specify a new Personal Folders file (.pst
file), and do not use the existing file.
NOTE: Because you do not use the old .pst file while you are
troubleshooting, you will not see any of your old .pst folders or files.
Part 2: Rename the Outlook Data Files
Outlook automatically replaces the Extend.dat, Outcmd.dat, and
Frmcache.dat data files if they are missing. To rename the data files and then
test to see if the problem is resolved, follow the steps that are appropriate
for your operating system.
NOTE: Outcmd.dat stores any custom changes that you make to your
toolbar buttons. If the problem is resolved after you rename this file, you
must make the custom toolbar button changes again.
Microsoft Windows 98 or Microsoft Windows NT 4.0
Quit all Microsoft Office programs.
Click Start, point to Find, and then click Files or Folders.
In the Named box, type extend.dat, outcmd.dat,
In the Look in list, click your local hard
Click Find Now to search for the files.
The default locations for
these files are in the following folders
If the problem is resolved and you use a .pst file in the
new and old profiles, change the new profile to use the old .pst file, or
import the contents of the old .pst file into the new .pst
For more information about how to create a new set of .pst
files, click the following article number to view the article in the Microsoft Knowledge Base: