Hi Mouran,
Sorry for the delayed response. Thanks for your help. I was really after a Microsoft doco that confirms Outlook caching is included in E1 since it generates network traffic way more than Outlook online mode, so I was simply unsure whether it does not matter how much network traffic users burn by accessing MS cloud. I've been working with Exchange and Outlook for 10+ years, so how to enabling cache mode is not an issue.
Thanks anyway.
Zoran