Make subfolders e.g. Inbox 2011, Inbox 2010, Sent 2011, Sent 2010 etc to help reduce the number of messages in a folder. (Check for any large archive folders you might have in addition to Inbox and Sent).
I have been using Outlook for Mac 2011 for 2 years and just this week switched from Brighthouse to Uverse internet. Now I keep receiving an Error Code 3259 'An operation on the server timed out. The server may be down, overloaded, or there may be too much net traffic.' This comes up for each of my two work Gmail accounts on Outlook (not using this with the ATT email account). Having issues sending emails and syncing Outlook during this time.
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I am certain it has something to do with the change to Uverse, although I can access the internet on my browser with no problem. Error - An operation on the server timed out. The server may be down, overloaded, or there may be too much net traffic. Explanation Mail could not be sent. Error -3259 Step 1: Verify that you can connect on the web First, test to see you can sign in using the web based application. For example, if its a Gmail account, visit gmail.com and Sign in. If you were able to sign in then proceed to the next step.
If you are not able to sign in, contact your email client to obtain correct user name and password. Step 2: Change the SMPT port to 587.
Start Outlook. Click Tools then select Accounts. In the Outgoing Server box change the port to 587. Close the windows and try send/receive again.