By default, the Server Timeouts setting in Outlook is low (~1 minute). When the Server Timeouts value is too low, Outlook can behave erratically (sending duplicate messages, not receiving new mail, etc). This can be the result of a larger mailbox, or an extensive list of files and folders to synch with.
To increase the value of the Outlook Server Timeouts, follow these directions:
- In Outlook, open the settings for the account (by clicking Tools then Email Accounts OR in newer versions of Outlook through Home and then Account Settings)
- Once you've opened the settings for your email account, click the More Settings button.
- In the More Settings pop-up window click the Advanced tab. Increase the Server Timeouts value to 5+ minutes.
- Click the "OK" button then click "Next" or "Finish" to close the account settings window.
At this point, it is recommended to restart your computer to push through the settings.