Since installing Microsoft Office 2010, I receive email in Outlook, but cannot send it. It just stays in "out" box.

Hi , R U using Exchange Server or even some POP3 Account ? Also check event viewer and check the error if there is any error so post it here please. Regards. Shafaquat Ali.M.C.I.T.P Exchange 2007/2010, M.C.I.T.P Windows Server 2008, M.C.T.S OCS Server 2007 R2

What version of Exchange are you connecting too? Mark Morowczynski|MCT| MCSE 2003:Messaging, Security|MCITP:EMA 2K7,EDA Win 7,ES,SA,EA|MCTS:Windows Mobile Admin|Security+|http://almostdailytech.com

check your PST size, try to make new PST and move your email to new PST and try send email..

Hi, What's your outlook profile? Is it pop3? If you are using a pop3 account, please follow these steps to enable the option "My outgoing server(SMTP) requires authentication": 1. Open Outlook. Click Tools->Options->Mail setup tab->E-mail Accounts. 2. Highlight the outlook account, click Change, click More settings. 3. In Outgoing server, check the box "My outgoing server(SMTP) requires authentication" then select "Use same settings as my incoming mail server."