It seems to be a bug in Outlook 2013: It doesn’t show the “New email” or “New …” when you right click on the taskbar.

To solve this do the following:

 

1. Unpin the Outlook 2013 icon from the Taskbar.
2. Exit Outlook.
3. Delete the following registry key: HKCU\Software\Microsoft\Office\15.0\Outlook\Setup
4. Open Outlook again and re-pin the icon.

 

Certutil -setreg chain\minRSAPubKeyBitLength 512

 

 

To see the per user size sorted bij size:

Get-MailboxDatabase | Get-MailboxStatistics | Sort totalitemsize -desc | ft displayname, totalitemsize, itemcount

To see the database size and free space within the database:

Get-MailboxDatabase -Status | Sort-Object DatabaseSize -Descending | Format-Table Name, DatabaseSize, AvailableNewMailboxSpace

to disable the teredo interface:

netsh interface teredo set state disabled

to disable to ISAtap interface:

netsh int isa set state disabled