1. While online, click Inbox.
2. On the Tools menu, point to Synchronize, and then click Offline Folder Settings.
3. Click Download Options.
4. Under Message size limit, select the Don't download messages larger than check box, and then enter in kilobytes the maximum size of messages you want to download. (50 kilobytes is a standard limit.) Outlook notifies you when it moves a message larger than this to the Large Messages folder, and enables you to view the message if necessary.
5. If you want to receive some large messages but not others, select the appropriate check boxes under Exceptions to specify which messages you want to download. For example, you can specify that messages from a certain person, such as your manager, be downloaded to your Inbox regardless of size.