Ilse Van Criekinge's Weblog

Addicted to Microsoft Unified Communications

Office 365 Beta for Enterprises

Office 365 Beta for Enterprises

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Quite a view subscribers to the Office 365 Beta have been given access to their beta tenant, as I gather by following the tweets on #Office365.

For more information on Office 365, just go to:

Given the amount of questions that are raised, I just felt like posting this blog post, with first the one link that you have to go to download all official information Office 365, and that is this one:


While going through the Microsoft Exchange Online Beta Service Descriptions, a few things popped out Glimlach


  • Message Size Limit for Exchange Online is 25MB (including attachments), this cannot be adjusted up or down. But, by creating transport rules, it is possible as an administrator to limit the maximum size of individual attachments
  • Recipient Limits:
  • Each Exchange Online mailbox can send messages to a maximum of 500 recipients per day
  • A distribution group stored in the GAL counts as one recipient
  • Message rate limits: users can send only 30 messages per minute (if more are sent per minute by a recipient, they will be queues and delivered)

Deleted Item & Mailbox Retention Time

  • Deleted Item Retention Time is set to 14 days
  • Single Item Recovery is enabled by default, and set to 14 days
  • Single Item Recovery can be extended, but depends on O365 USL
  • Deleted Mailbox Retention Time is set to 30 days

Supported clients

  • Outlook 2003 is NOT supported!

Outlook Web App

  • OWA Logon Page can be customized when using ADFS v2 to provide Single Sign-On with Office 365
  • Public Computer or Private Computer Options are not offered
  • Change password from within OWA is possible, when NOT using ADFS v2

Shared Mailbox

  • Do not need a license
  • But all users accessing a shared mailbox requires a USL (Exchange Online Kiosk workers cannot access shared mailboxes!)

Something you can’t do in Exchange On Premise environment = Connected Accounts!!

  • Enables users to connect external email accounts to their Exchange Online accounts, and use OWA to send and receive mail from these connected accounts
  • Can be disabled by an administrator

Address Lists

  • Creating of custom address lists, Global Address Lists views is not supported

Calendar Sharing through iCal is possible!

Conference Rooms

  • Do not require a USL
  • Mailbox quota is 250MB


  • Exchange Online uses the same RBAC framework as Exchange Server 2010 Service Pack1
  • Exchange Online provides Administrator Audit Logging, and Mailbox Audit Logging
  • Exchange Online can be used as an SMTP delivery service to relay email messages sent from fax gateways, network appliances, and custom applications
  • Exchange Online provides the ability to route outbound mail through an on-premises server or a hosted service

In the Appendix, you can find a nice Exchange Online and Exchange Server 2010 Service Pack 1 Feature Comparison!


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