If the document you wish to send as attachment can be accessed on a shared directory (e.g. an Internet Server), you can send a shortcut of the document in an e-mail. Instead of sending the actual document, you only send a link to the document. In addition to saving bandwidth, this allows the recipient access to the latest version of the file.To send a link, navigate to the document in Windows Explorer and right-click on it. Then choose Send to… and select Clipboard (as name). Navigate to Outlook, open a new e-mail and insert the link which you have just saved to the clipboard.
Also if you need to Check the Folder Size in Outlook..
To get an idea about the size of your mailbox at a given time, you can use the Outlook Mailbox Cleanup. Navigate in the menu bar to Tools > Mailbox Cleanup > View Mailbox Size....
