Also see the following on compacting from Bruce Hagen MVP Outlook Express
<snip>
The problem is with the registry counter that gives you the prompt after 100
closings of OE. It is being increased quicker than it should be and even if
you are not using OE.
There is a growing number of programs and actions that may be causing this
after installing SP3. Do you have any of the following?
IBM Rapid Access keyboard (driver) RAKDLL.DLL
Windows {Desktop} Search
Mailwasher
Nero plug-in(s)
Opening EML files while OE is closed will also contribute to the registry
count.
Various anti-virus, anti-spyware and third party firewalls, especially if
they were running when you installed SP3.
Archived thread discussing this issue in June 2008:
http://groups.google.com/group/micr...ss.general/browse_frm/thread/fcd35fbfa457fd6f
In the case of Windows Desktop Search, (the #1 offender), you have to tell
it to stop indexing OE.
Windows {Desktop} Search. Set Desktop Search Options:
http://www.microsoft.com/australia/windows/desktopsearch/search/options.mspx
In Windows {Desktop} Search: Control Panel | Indexing Options. Click: Modify
and clear the check box for Outlook Express.
In the case of Nero Scout, see Item 2.3 on page 8 here.
ftp://ftp6.nero.com/user_guides/nero8/scout/NeroScout_Enu.pdf
In the option to exclude selected file types from indexing, be sure to add
these file types:
..eml, .dbx & .nws
<end snip>