If you’re running an Exchange Server, and ever faced “excessive Database and/or Transaction log growth problems.” This can cause big issues, especially if the disk housing the transaction logs is not big enough to accommodate for this growth between online backups. If you’ve ever run in to one of these issues, you’ll find that they’re not always easy to troubleshoot as there’re many tools that’re needed to help understand where the problem might be coming from. Once an Outlook client has created a profile to the Exchange server, they pretty much have full reign to do whatever actions they want within that MAPI profile. This of course, will be controlled mostly by your Organizations mailbox and message size limits and some of the Client throttling or backoff features that are new to Exchange 2007. Check this post to troubleshooting store log/database growth issues.