1. Open Outlook & Click File> Info > Tools > Clean up old items. 

2. Click the Archive this folder and all subfolders option, and choose the folder you want to archive. (Note: If you select Archive All folders according to their AutoArchive Settings it will freeze out Archive items Older than & Archive destination & will serve as AutoArchive)

3. Under Archive items older than, enter a date.

4. It is also possible to create multiple .pst files if you want to archive some folders using different settings. For example, you may want to keep items in your Sent folder longer than items in your Inbox folder.

5. Check the Include items with “Do not AutoArchive” checkedbox to archive individual items that are excluded from automatic archiving. This option doesn't remove that exclusion from these items, but instead ignores the Do not AutoArchive setting for this archive only.

6. Click OK

Turn off AutoArchive

To archive only when you want, turn off AutoArchive.

1. Click File> Options > Advanced.

2. Under AutoArchive, click AutoArchive Settings.

3. Uncheck the Run AutoArchive every n days