+ 0 Votes Sorry, you're out of luck..... ThumbsUp2 6 years ago That drop-down list is only a list of recently used email addresses. It is populated as you type full addresses into the address bar or select one from your contact list. There are many cleaning routines that clean up those recently used "lists". It's hard telling what you might have run to clean up things like this. But, if they've been deleted, they're gone.From now on, I suggest you put important contact information in permanent storage, like your CONTACT LIST where they're supposed to be stored.... + 0 Votes See if this will help Jacky Howe 6 years ago Contact information does not appear in the address book in Outlook<br><br><br><br>http://support.microsoft.com/default.aspx?scid=kb;en-us;287563&Product=ol2002<br><br><br><br><i>Keep us informed as to your progress if you require further assistance.</i><br><br><br><br><font size="1"><i>If you think that any of the posts that have been made by all TR Members have solved or contributed to solving the problem, please Mark them as <b>Helpful</b> so that others may benefit from the outcome.</i></font> + 0 Votes Backup your nickname file anthony.sartini 6 years ago Not sure why your addresses disappeared and then suddenly reappeared but my advice is to backup your Outlook nicknames file.Everytime you enter a contact's email address in the To, CC field etc it gets added to a file called Outlook.NK2 which is generally located here: C:\Documents and Settings\Application Data\Microsoft\Outlook.Then, if for some reason your contacts disappear, you can copy back in this nickname file and when you start Outlook it should be fine.