Powershell O365 modify UPN login info for a dirsync’d account AFTER updating AD (as in first).
Set-msoluserprincipalname -userprincipalname [old user name] -newuserprincipalname [new user name]
Find and remove duplicate items in Outlook.
If your Outlook data is indexed by Windows Search, you’ll not only get lightening fast search results within Outlook but also outside of Outlook such as the search fields in Windows Explorer and the Start Menu. For this, many search operator and fields are available. This is a reference guide to these operators and fields and how to use them.
Exchange Hyper-V Virtualization