How to Upgrade Outlook IMAP Emails
IMAP is an improved mail protocol over the POP3 mail standard that adds many features that make it easy to keep several mail clients, all tied to a single account, in sync. While Microsoft Outlook supports the IMAP protocol, its support is not as fluid as it is for the POP3 mail protocol. As of Microsoft Outlook 2010, IMAP support is as fluid as other mail clients, but if you use an earlier version there are a few things you can do to upgrade the performance of IMAP in Outlook.
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Instructions
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Launch Microsoft Outlook from your "Start" menu.
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Click "Tools" and then "Send/Receive Settings." Click "Define Send/Receive Groups," then "Edit" and tick the "Inbox" check box. Select the "Download complete item including attachments." Change the "Spam" folder in the same way, but select the "Download headers only" option. Click "OK" to continue.
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Adjust the time that your mail client queries the IMAP server for more messages. This is purely a preference setting and is not necessary to improve speed except that the more frequently you check your mail, the more up to date your in-box will be. Close the "Send/Receive Settings" menu to return to the main Outlook screen.
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Click "File" and then choose "Work Offline" from the menu. This option will keep Outlook from querying the IMAP server every time you try to open a message and speed up load times.
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Tips & Warnings
Optionally, you can disable all of your Add-Ins to improve the speed of Microsoft Outlook as well.
