Microsoft posted about a bug in the Outlook 2010 Beta where the usage of number and bullet lists causes redundant CSS definitions to be included in each outgoing message. The outgoing message might not display correctly in a mail service where there’s a limit to message size, such as Gmail, BlackBerry e-mail, or Craigslist. Office team has released a fix for this issue, that prevents future messages from consuming unnecessary space, but doesn’t resize existing messages. If you reply or forward an existing message that is affected by this bug, it remains enlarged. To help reduce the impact of large messages on your Inbox and mailbox storage quota, you can also run Conversation Cleanup (new feature in Outlook 2010) on large folders. On the Home tab, in the Delete group, click Clean Up. Also, consider starting new message conversations or threads when possible.