A user complains about autocomplete being slow filling addresses in Outlook 2007. I have taken her outlook.n2k file and put it on my PC and it works fine. I reinstalled Office 2007 for her, still slow. I gave her a different computer with a fresh install of Office 2007, still slow. This is not the old nk2 file from Office 2003, it is relatively new and not that big ~700k. her mailbox is huge, 1.6GB. Could that have something to do with it? I have disabled her add ins, indexing is not running, I have taken all the steps I could find on the internet to no avail. Like I said the same nk2 file works great on my computer. I even put my nk2 file on her brand new PC and it opens slow. So can it be the size of the mailbox?