Hi Robert,
This issue can occur if the Outlook cache files are corrupt. Please perform the steps below to rename and recreate them:
Step1: Rename Cache files
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Perform a search on your computer to find the following files:
extend.dat
outcmd.dat
frmcache.dat
views.dat
NOTE: Some of them may not exist, but it should not matter. You may also need to show the extension of the file and enable the "show hidden files" option in
"Folder Options". To do this, please perform the following steps:
a. Start-->Control Panel
b. Click Folder option
c. Click "show hidden files and folders" in the View tab
d. Click "Start", point to "Search"
e. Click "All Files and Folders" and click "More Advanced Options" and make sure the following options are checked:
--Search System Subfolders
--Search Hidden files and folders
--Search Subfolders
f. In the "All or Part of the File Name" box, type one of the above files' names and click "Search".
g. Right-click the file and rename the files.
"extend.dat" To "extend.old"
"outcmd.dat" To "outcmd.old"
"frmcache.dat" To "frmcache.old"
"views.dat" To "views.old"
NOTE: If you cannot rename the files, simply back them up to another folder and then delete them.
Regards,
Scott Atkins MCSE, MCSA
Partner Technical Lead - Outlook
Microsoft Technical Support
for Platforms and Business Applications
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