Cached mode gal not updating
Frequently users report recipients missing from the GAL. Scenario:– Recipients are not hidden from Exchange Address Lists– Recipients do show up in the “All Users” Address List– Recipients do show up when Outlook’s not in Cached Mode– Recipients resolve in Outlook Web Access Some recipients may not be included in the Offline Address Book when it is generated, for a number of reasons. New users don’t show up in the GAL for clients using Outlook 2003 Cached Mode clients, because Outlook uses an Offline Address List (aka “Offline Address Book” or OAB), which is generated once every 24 hours by default [read previous post “New user does not show up in GAL“] In this case there are who did show up in the GAL earlier but have disappeared now.The offline address book is only updated once every 24 hours, however the update can be forced by (send/receive, download offline address book). Note: Outlook ‘cached mode’ OST file is not related to the offline address book or outlook name cache.
Or to delete one bad entry from it, start typing the name, let it auto-fill, then hit the delete key on the keyboard when the autofill address is show in the To bar.
May not help the original poster, but it's worth noting that deleting NK2 files is overkill.