Clear and reset the automatic completion caches in Outlook

Outlook 2010

1.     Open a new email message.

2.     Type the first few characters of the nickname cache entry that you want to remove from the cache.

Figure 1: Suggested name (Outlook 2010)

3.     When the entry appears in the "suggested names" list, move your mouse pointer over the name until it becomes highlighted. (But do not click the name).

4.     When the “X” icon appears next to the highlighted name, click X to remove the name from the list.

Outlook 2007 or 2003

1.     Open a new email message.

2.     Type the first few characters of the nickname cache entry that you want to remove from the cache.

Figure 2: Suggested name (Outlook 2007)

3.     When the entry appears in the "suggested names" list, use the UP and DOWN arrow keys on your keyboard to select the entry, and then press DELETE on your keyboard.

Clear whole Outlook nickname cache for Outlook 2010

1.     In Outlook 2010, click “File”.

Figure 3: File tab

2.     Click “Options”.

3.     At left pane, click “Mail”.

4.     Pull down to “Send messages”.

Figure 4: Send messages session

5.     Click “Empty Auto-Complete List”.

Clear whole Outlook nickname cache for Outlook 2002 to Outlook 2007

Windows 7 or Windows Vista: Use the following steps to reset the whole Outlook nickname cache.

1.     Exit Outlook.

2.     Click Start, and then click Computer.

3.     Click Organize, and then click Folder and search options.

4.     On the View tab, click to enable the Show hidden files, folders, and drives option.

5.     Click OK.

6.     On the Start menu, click All Programs, click Accessories, and then click Run.

7.     In the Run dialog box, type the following command (including the quotation marks), and then click OK:
“C:\ Users\UserName\AppData\Roaming\Microsoft\Outlook”

Note: Username in this path is the name of the currently logged on Windows user.

8.     Right-click the .NK2 file that has name of the profile that you want to reset, and then click Rename.

9.     Rename the file as profilename.bak, and then press ENTER.

10.  Start Outlook.

Windows XP: Use the following steps to reset the whole Outlook nickname cache.

1.     Quit Outlook.

2.     Click Start, and then click Search.

3.     In the Search Companion left-side panel, click All files or folders.

4.     In the All or part of the file name: box, type *.NK2.

5.     In the Look In box, click to select your local hard disk.

6.     Click More advanced options, click to select Search hidden files and folderscheck box.

7.     Click Search.

8.     Right-click the .NK2 file with the name of the profile that you want to reset, and then click Rename.

9.     Rename the file to profilename.bak, and then press ENTER.

10.  Quit Windows Explorer.

11.  Restart Outlook.

Reference:
How to reset the nickname and the automatic completion caches in Outlook

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