If you are having problems opening files in Outlook make sure to delete the Outlook Secure Temporary Files.  They can be a pain to find however.  The directory that holds them in Outlook 2000 & 2003 is:

C:\Documents and Settings\%username%\Local Settings\Temporary Internet Files\OLK”followed by numbers”

The OLK will be followed by a series of numbers.  The only problem is you might not see the OLK directory and searching for it doesn’t work.  Revealing Hidden files won’t work either.  In that case the only way to get to it is to find out what the exact OLK directory name is and type it in manually.

For instance the one I worked on today was just …\OLK5.  I found it by opening the users email and finding a file they had previously been able to open.  In this case an Excel file.  Once opened I went to File | Save as and took a look at the folder it was being saved to.  Anyone know of an easier way to do that?  See update below.

Outlook 2007 keeps the same files here:

C:\Documents and Settings\%username%\Local Settings\Temporary Internet Files\Content.Outlook\”some string of characters”

And Vista moves them to:

C:\Users\%username%\AppData\Local\Microsoft\Windows\Temporary Internet Files\

Update: There is an easier way to find out where the Outlook Secure Temp Folder is stored (\OLK*).  Run regedit, click Edit | Find, and search for:  OutlookSecureTempFolder.  The entry in that key will be the path to the OLK* folder.  Just copy it and paste it in Explorer.

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