When you use mail flow, you aren't adding a signature, you are adding a disclaimer. These are always added at the end of the message;.

Export members of an Exchange distribution group using PowerShell or Azure AD.

Recent changes to Office 365 tenants to be FedRAMP-compliant is causing problems for some users with personal and government email accounts in the Outlook apps for Android and iOS.

Use PowerShell to create a list of mailboxes with Send as permissions assigned.

The problem: when users leave the company, they create server side rules to forward their mail to an outside address. An administrator wanted to know if there was a way to clear rules in Outlook or with a PowerShell command. Yes, you can use PowerShell to check for and remove forwarding rules. Use the first  

How to move an Outlook offline data file (.ost) typically used by Exchange servers, but also used by IMAP accounts with Outlook 2013 and up.

How to add additional email addresses to Exchange mailboxes.

How to share category colors on appointments that are in a shared calendars.

Outlook 2016: Attachments are deleted from plain text messages after the January 9 2018 Security Update.

An administrator wanted to know if he could set up global safe and blocked lists for distribution to his users. There two options: add domains and addresses to the safe or blocked lists in Exchange admin center or to Outlook using powershell.