Category Archives: Office 365

Multi-Factor Authentication in Office 365

Multi-Factor Authentication (MFA) is the concept that hardens the security of authentication services by adding an additional layer of verification to conventional user name and password based authentication. For example, this could be an SMS, a phone call or smart card, etc… MFA has been around in the industry for quite some time now and many of us have… Read More »

Control Send / Receive Limitations In Exchange Online

Every Exchange Online user in Office 365 has the capability of sending and receiving email messages up to 150MB in size. To utilize the maximum allowed limits, you’ll have to use the Outlook client. To learn more about Exchange Online limitations, navigate to However, some organization may not be very happy to give their users… Read More »

Enable DKIM Signing for Outbound Emails in Exchange Online Protection

Last year Microsoft announced support for DomainKeys Identified Mail (DKIM) signing for outbound emails in Office 365. If you are wondering what DKIM is, below is an excerpt from Microsoft blog describing what DKIM is in its simplest form. DKIM permits the person, role or organization, who owns the signing domain, to claim some responsibility for… Read More »

Exchange 2010 – Exchange Online Hybrid: Email Moderators Receive An NDR When An Action Taken

By | February 17, 2016

While working on an Exchange 2010 – Exchange Online hybrid environment, few users encountered an error where after migrating email moderators to the Exchange Online, moderators receiving an NDR when they take an action for a moderated email. Below is an excerpt of the NDR. From: Microsoft Outlook Sent: Thursday, January 14, 2016 10:30 AM… Read More »

Azure AD Connect Sync Errors: UPN Changes Aren’t Synced

By | January 13, 2016

I was working at a customer’s location few days back on an Office 365 hybrid deployment. I faced an issue where one of the users that was being synced from the on-premises Active Directory was having a different UPN on the Azure AD. This user’s original UPN was changed in the on premises Active Directory because of… Read More »

Exchange Online and Exchange Server Hybrid Federation Metadata Refresh Error: Unable to Access the Federation Metadata Document From the Federation Partner

By | January 9, 2016

I was working on an Exchange Online and Exchange Server hybrid environment where the customer complained that on premises users cannot view free/busy status of Exchange Online users. Primary cause for this issue to occur is, if certificate and other metadata information in the Microsoft Federation Gateway or in the on-premises environment become stale or invalid.

Office 365 Remote Move Migration Error: Domain Is Not an Accepted Domain

By | January 5, 2016

Error: MigrationPermanentException: You can’t use the domain because it’s not an accepted domain for your organization. –> You can’t use the domain because it’s not an accepted domain for your organization. A small configuration mistake that can go unnoticed to many system admins who are new to Office 365 and Microsoft Exchange hybrid environments will result in above… Read More »