I recently completed a reinstall of Windows 7 on my Dell laptop and have been having to reconfigure everything for a couple days to get back up and running the same way I was before the reinstall. One thing I decided to actually upgrade in the process was Microsoft Office from MS Office 2007 to MS Office 2010. So far it appears that Office 2010 is much less bulky than 2007 so I am really happy with the upgrade choice even though typically during a reinstall I try not to upgrade many things so if there are any problems it is easier to isolate the issues. One thing that changed in Office 2010 was the nickname cache or the use of NK2 files so you have to actually import your NK2 file into Outlook 2010 for nicknames to start working. Follow the directions below to import your NK2 file into Outlook 2010.
Over the past couple of years I have been using the same Outlook files which have over time built up a huge cache of invalid e-mail addresses, e-mail address that are no longer used, and various other e-mail addresses I want to remove from the e-mail address cache. The cache that I am talking about is when you compose a new message and then start typing an address into the To, CC, or BCC field it begins to auto complete. On numerous occasions I have mistyped my own address and sent emails which now brings up numerous emails similar to my own and I have to make sure I select the proper one each time. Needless to say I needed to figure out what Outlook 2007 cache file stores these messages and how to edit that file to remove and modify addresses.