When I start to type in an email address and auto complete drops down with suggestions, some of those are ones I have deleted and new ones don't appear. I deleted 2 ".nk2" files. One was Outlook.nk2 and one was "My Name".nk2. I noticed that each day following there was no autocomplete addresses so I looked in the file and days later there are no .nk2 files. I guess they are not rebuilding.
I unchecked the "Suggest names while completing To, Cc, and Bcc fields" box and closed the program. Waited a bit an then checked it again ( I don't believe I closed the program in between if that makes a difference). I noticed that as I sent emails during the day the names that had been used did autocomplete. This morning after I started my computer I checked the Outlook file and there are no .nk2 files and of course no autocomplete in emails. Any thoughts appreciated.