 This usually means a greater reliance on tables and inline stylesheets.Microsoft Windows applications by default create email messages via MAPI.Several vendors produce tools to provide a MAPI interface to webmail.<ref></ref><ref>Affixa (Creating messages directly from Windows applications via MAPI)</ref>

Although emails stored unencrypted on any service provider's servers can be read by that service provider, specific concerns have been raised regarding webmail services that automatically analyze the contents of users' emails for the purpose of targeted advertising.<ref></ref><ref></ref><ref name=GmailAds></ref> At least two such services, Gmail and Yahoo!