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Jeff Guillet
318 followers -
Exchange MCSM & MVP, Author, and Blogger
Exchange MCSM & MVP, Author, and Blogger

318 followers
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Exchange and SPF, DKIM, and DMARC. Oh my!
Email security should be top-of-mind for any organization. Being that the SMTP protocol does not provide much (any) security or authentication natively, we rely on frameworks and extensions to provide these capabilities. Here's a quick primer on what they a...
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Azure AD Connect version 1.1.751.0 released for download only
Microsoft just published Azure Active Directory Connect version 1.1.751.0. This is a big fix version that resolves two specific issues: Corrected an issue where automatic Azure instance discovery for China (21Vianet) tenants was occasionally failing. For AD...
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Cross-Premises Mailbox Delegation in Hybrid Office 365
Exchange hybrid organizations commonly ask about delegating mailbox permissions between on-premises and cloud users. I'm happy to say that this is finally becoming a reality. This is being rolled out to all Office 365 tenants by the end of April 2018. Gone ...
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Join me at the Microsoft Tech Summit in San Francisco March 19-20!
Please join me for the Microsoft Tech Summit San Francisco  March 19-20, 2018 at the Marriott Marquis in downtown San Francisco. Register here . On Monday, March 19, I'll be at the " Ask The Experts Networking Hour " at 5:45PM PDT. This will be an opportuni...
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FREE Webinar: Top 10 Tips for Migrating to Exchange 2016
Have you recently migrated or are you thinking about migrating your organization to Exchange 2016? Join me for this recorded webinar as we discuss the top 10 tips and tricks. Among other topics we'll discuss: What features do you need from Exchange 2016? Wh...
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Announcing AAD Connect 1.1.749.0 with new privacy and troubleshooting features
Microsoft is drizzling out a new build of Azure Active
Directory Connect via auto-upgrade to select customers. They often do this when
a new build has significant changes to make sure it doesn't break in existing
organizations that currently use AAD Connect...
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Warning - High number of corrupt items in hybrid migrations
I'm publishing this article as a public service announcement since Microsoft is not warning customers in the Office 365 Service Health Dashboard . Beginning last week, we noticed that hybrid mailbox moves to Exchange Online started failing with a very high ...
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Wash the "unclean". Fixing mailbox enabled cloud-only user accounts in Office 365 for hybrid migrations.
I've come across the following scenario in a number of migration projects. The customer creates a new tenant with or without AAD Connect with the intention of "kicking the tires" in Office 365. They create several cloud-only accounts and assign them license...
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Email Address Internalization (EAI) support in Office 365
Today, Microsoft announced that Office 365 will enable Email Address Internalization (EAI) support in Q1 2018. This may have important implications for hybrid customers and those organizations involved with mergers and acquisitions. Here is the announcement...
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Hub Transport fails when NIC is not set to register in DNS
In a previous post I wrote that  email delivery fails after installing Exchange 2016 CU8 . Fellow MCSM and MVP Brian Ricks reminded me of an old bug in Exchange Server that causes Hub Transport services to fail if a server is not configured to register this...
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