To fix Outlook cannot log on, verify you are connected to the network error, follow these steps: Search for the control panel in Taskbar search box. Click on the individual search result.

Start Outlook 2007. Select the "Tools" menu and choose "Options." Select the "Preferences" tab and click on the "Junk Email" button. The Junk E-Mail Options dialog box opens.

I've got an Outlook 2003 client connected to an Excahnge 2000 server. Emails I receieve from one sender I can never open up in the Outlook client. I always get:<BR>Can't open this item. Unknown ...

Microsoft is currently rolling out a new Office 365 feature dubbed 'Unverified Sender' and designed to help users identify potential spam or phishing emails that reach their Outlook client's inbox.