: If your archive file (the .pst file) has reached this limit, Outlook cannot add any more data to it, effectively stopping the archive process.

Sometimes a single setting on a specific folder overrides your global AutoArchive rules. Outlook 2010 will not archive subfolders of the Inbox

If your Outlook 2010 archive feature isn't moving old emails, it's usually due to one of three common technical "stumbling blocks." 1. The "Modified Date" Trap