Why are some emails in Outlook hundreds of Kb in size and others as little as 1 Kb but may contain only one or two sentences in them? The Inbox in Outlook can easily exceed its capacity with relatives few messages due to the fact some msgs are bloated in size and others are not. You can’t tell the size of a msg by looking at it. Tracked msgs are very large and they are only 3 or 4 lines of text from the servers. Why is that? What determines the msg size? What features in Outlook bloat the file size?