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Unable to send email from Outlook after Office 365 Upgrade

3 Feb 2013 by Emma Robinson

Some users who have recently upgraded from the existing Office 365 version to the new Office 365 version (Wave 15) have experienced issues when trying to send emails using Outlook.
This can be fixed by disabling Outlook Cached Mode. You can find instructions on how to do this below:
Disable Outlook Cached Exchange Mode for Outlook 2003
Disable Outlook Cached Exchange Mode for Outlook 2007
Disable Outlook Cached Exchange Mode for Outlook 2010
Disable Outlook Cached Exchange Mode for Outlook 2013
Are you experiencing this issue? Did this work-around fix it? Let us know in the comments below.