Issue Description Windows Outlook users who use the Marketo Sales Connect plugin might have noticed that emails don't send as fast as they usually do. Unfortunately it takes a little longer than usual on this particular platform due to a recent MSC plugin update. We are working on a long-term fix for this subset of customers, but in the meantime you can use the following workarounds:
Issue Resolution If you switch Outlook to, "Online Mode" (as opposed to Cached Exchange Mode) this will decrease the total sending time. You can follow this document in order to turn off Cached Exchange Mode. If you would like to learn more about the differences between Online Mode and Cached Exchange Mode, you can read more here.
Alternatively, you can also use the Web version or Mac version of Outlook to address this issue.
Who This Solution Applies To Windows Outlook users who utilize the Marketo Sales Connect plugin.