If you need help handling attachments, chances are your mailbox needs a good cleaning. LBE Toolbox for Microsoft Outlook (limited version, free; full version, $14.95) presents a streamlined interface for removing and storing attachments based on their size and freshness. To save space, it finds and removes duplicate versions of contacts, calendar entries, and e-mails.

Another helpful feature supports mass mailings. You can quickly select among groups, lists, and categories in your contact database, or even select a company name, then space the outgoing messages at regular intervals so your mail server is not overloaded.