Outlook address problem

When adding an address when sending a mail sometimes returns a " ; " instead of the email address. Well. In 90% of the cases. And it doesn’t seem to be random eithre. Some addresses always work. And the others just always becomes " ; " when adding them.

I’ve tried to compare the contacts but I cant spot any difference whatsoever in them =/.

I’m kind of clueless as what to do here. And I need to send out a mass mail to 300 people tomarrow so help would be really appriciated.

Thanks!

edit: I recently reinstalled outlook and exported/imported the addresses to a DB file. Now it’s all of those old addresses that turn up as " ; ". While the new ones which I’ve added since then works. I can still see them all in the address book though. So it’s really odd =/.