Email Address Resolve (Auto Name Check)

If the PAB entry has the first and last names in the First name field, when they're converted the name is not parsed into the appropriate First name and Last name fields. Since the Last name field is empty, you can no longer use it to resolve the addresses. This gives the impression that the Contacts folder is not being used to check email addresses.

If you have a large number of contacts it may be easier to recreate them if you know exactly which records do not have a populated Last name field. You can isolate those contacts with no last name and are not Distribution lists, by creating a custom view.
If you type a partial name for an individual Contact, into the To field of a new message, it will resolve properly. This is also true of partial names for DLs stored in the PAB. However, this is not true of partial names for DLs stored in the Contacts folder. The names of DLs in the Contacts folder are stored as one complete property rather than three (first name, middle name, last name), as are individual contacts. This assists in maintaining their sort sequence when switching between last-name/first-name and first-name/last-name displays but does not allow partial entries to be expanded into full names.

Do you folks have a huge address list, or does he have a huge contact list? Normally it shouldn't take that long to resolve unless their is some kind of network problem going on. I would check to see in TOOLS>SERVICES, which list Outlook uses to first resolve the names. Then set it to the list the user would most likely want his resolves to come from. If this does not work you may want to try turning the auto name check off and have them force it with a CTRL-K or the Check Names button.

Is this happeneing from every client or it's and specific pc?
Double check in mail (outlook) properties if the client (or clients) have only the outlook PAB and the microsoft exchange server only.

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