A draft e-mail message in Microsoft Outlook desktop client can stay open indefinitely, provided that the program isn't closed and the computer stays powered on. Draft e-mail messages in a Microsoft Outlook web client or running through a VPN may be lost if the internet connection is lost, or if the connection or authenticated session is closed or reset. In the event of a loss of power, or lost connection, any unsaved changes to the draft e-mail message will be lost.
While this is true in theory, it's not a good idea to leave a draft message open, or even to leave a computer running unnecessarily, for days on end. The longer a computer or program is running, the greater the chances of something going wrong.
By default, Microsoft Outlook 2003 and 2007 automatically save draft e-mails every three minutes. Older versions of Microsoft Outlook don't have this feature. If someone else installed or configured Outlook for you, you might want to check to make sure they didn't disable this feature. The auto-save feature in Microsoft Outlook 2007 and 2003 can be accessed by going to:
Tools > Options > Preferences tab > E-mail Options -> Advanced E-mail Options.
Posted 3837 day ago