This quick post is on a highly confusing (IMHO) subject of Microsoft licensing. Have you ever heard of CAL Suite Bridges for Office 365? Do you know what they are? If you need a quick overview, I would suggest taking a look at the following article.
Another update (11/19/2013): further evolution of Office 365 services makes creation of distribution and security groups even easier, plus there's now an option of creating a dynamic distribution group (click here for more information): Update (08/06/2012): a clear sign of Office 365 evolving along the same lines as other agile cloud services - small incremental features and minor new functionality are being delivered almost continuously and, unlike important major service updates, without much fanfare. For example, there's no need to resort to using PowerShell to setup mail-enabled security groups anymore, it can now be done at creation using management portal: Those managing Office 365 ( O365 ) tenant via the Microsoft Online Services Portal ( MOS Portal ) interface would notice that there are two distinct group entities: Security Groups: can be created via MOS Portal (main portal page>Management>Security Groups) and used for assigning