Running Outlook 2010 offline can be useful if you want to perform any task other than email. But what if you have 100 emails and it is taking forever to download them? By default Outlook 2010 downloads both the emails and the attachments and does not ask the user about this setting when setting up an account for the first time.
In Outlook 2007 you could hit Ctrl+Alt+S to open your Outlook Send and Receive Groups, but this is not the case in Outlook 2010. You first need to head over to the Send/Receive tab and Go to Send/Receive Groups -> Define Send/Receive Groups as shown in the screenshot .