Shared Mailboxes in Office 365

In Exchange 2013 there are regular Mailboxes and there are Shared Mailboxes. The latter are user independent Mailboxes and have common email addresses, for example or These Mailboxes don’t have a specific user account but are mostly shared between a number of users.

The interesting part is that you don’t need a license to implement a Shared Mailbox (or a Resource Mailbox for that matter) but the users that access the Shared Mailbox need to be licensed though.

There used to be a 10 GB size limit on Shared and Resource Mailboxes, but this was changed recently (November 2014) and all Shared and Resource mailboxes are now restricted to 50GB, just as regular Mailboxes. You can check this on the Exchange Online Limits page on Technet.

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Move mailboxes using MigrationWiz

If you don’t want to use the standard Microsoft tools for migrating Mailboxes to or from Exchange Online you have to use a 3rd party solution. One online solution is MigrationWiz from BitTitan. There are a number of advantages of using MigrationWiz over the standard Microsoft tools, especially when using a Cutover Exchange Migration (CEM) or a Staged Exchange Migration (SEM). A Cutover Exchange Migration is basically a big bang scenario where you switch all services at the same time and gradually migrate all the Mailbox content. There’s no way to schedule anything here and this is much better when using MigrationWiz.

MigrationWiz is using Exchange Web Services to login to your on-premises Mailbox and to your online Mailbox to move all the content between the two platforms.

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Auto-forward in Office 365

A customer is running Exchange 2010 on-premises and has auto-forwarding of email messages disabled on an organizational level. After building a hybrid environment and migrating some users we found out that users were able to auto-forward email messages to external recipients.

In Office 365 auto-forward is enabled by default on an organizational level, but can be disabled on a tenant level by using Transport Rules. To achieve this, logon to the Exchange Admin Center of Office 365 ( and select Rules in the Mail Flow section.

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We’ve run into a problem with your Office 365 subscription

After moving some Mailboxes from Office 365 to Exchange 2013 on-premises and disabling licenses in the Office 365 portal I got the following warning on my computer (laptop and workstation):

Account Notice

We’ve run into a problem with your Office 365 subscription, and we need your help to fix it.


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Configure disks using PowerShell in Windows 2012 R2

When installing and configuring a large Exchange environment you most likely will have a lot of disks attached to the Exchange servers. Manual configuration of the disks is no fun so PowerShell is your friend here.

These are the steps that need to be done:

  • Create directory structure for the Mount Points (New-Item).
  • Set the disks online and initialize them (Initialize-Disk).
  • Create the partitions (New-Partition).
  • Link them into the Mount Point structure (Add-PartitionAccessPath)
  • Format them (Format-Volume).

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