250 Hello - Exchange Online

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Exchange Autodiscover Publishing Blocked By L7 Load Balancer

Posted on 22nd February 2022 by Rhoderick Milne [MSFT]

When deploying an Exchange Hybrid configuration, one of the most critical components to publish externally is the Autodiscover service. Autodiscover enables seamless client connectivity and hybrid functionality between on-premises Exchange and Exchange Online, including mailbox moves, free/busy lookups, and Outlook profile configuration. However, publishing Autodiscover to the Internet can become … Read the rest “Exchange Autodiscover Publishing Blocked By L7 Load Balancer”

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Microsoft Teams Source IP Address Used Connecting to On-Premises Exchange

Posted on 14th February 2022 by Rhoderick Milne [MSFT]

Teams IP Addresses Connecting to Exchange On-Premises

Planning to deploy Office 365 and integrate with your on-premises Exchange infrastructure? Great! While running the Exchange Hybrid Configuration Wizard (HCW) will be one of the highlights it should be a boring and uneventful portion of the project. That will be true if all of the required planning, remediation and preparation was done. If not you’ll be finding out about those issues pretty so… Read the rest “Microsoft Teams Source IP Address Used Connecting to On-Premises Exchange”

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The Way Things Were–EOP IP Ranges October 2018

Posted on 3rd February 2022 by Rhoderick Milne [MSFT]

When discussing network configuration for Office 365, there will be a series of issues and challenges that need to be addressed. Ideally this is all done in a proactive manner, with the final items addressed in the POC phase.

One of the cornerstone issues is around how access to and from Office 365 will be managed. This has to address end user access from workstations and publishing your on-premi… Read the rest “The Way Things Were–EOP IP Ranges October 2018”

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Office 365 Autodiscover Lookup Process–Revisited

Posted on 12th January 2022 by Rhoderick Milne [MSFT]

Previously we looked at the Office 2010 client and how it used Autodiscover to detect Exchange Online (EXO) mailbox settings. Outlook 2010 is no longer supported, so it is worth updating these notes for a current build of Outlook.

As with the previous post, this is intended as a point in time reference as I personally find it handy as an ongoing reference. In the updated example below a fully patc… Read the rest “Office 365 Autodiscover Lookup Process–Revisited”

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Add Domain to Azure, What Is Its EXO Status?

Posted on 26th October 2021 by Rhoderick Milne [MSFT]

Add Domain To Azure AD - What Is The Domain Type in Exchange Online

A recent discussion revolved around adding domains to Azure, and how that would manifest iteslf in Office 365 and Azure. This was a customer where one set of admins was focused on Azure and others on Office 365 and they did not interact much.

Lab Starting Configuration

You will note that initially there are three domains shown in Exchange Online portal. One is a custom vanity domain - tailspintoys… Read the rest “Add Domain to Azure, What Is Its EXO Status?”

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Exchange Online Transport Rule Audit

Posted on 27th September 2021 by Rhoderick Milne [MSFT]

This is a topic that still comes up when doing email investigations. After there has been an issue, we want to perform analysis to determine what may have happened any potentially why certain security controls did not act the way we expected.

With email one example would be around the audit information collected when an Exchange Online transport rule acts upon a message.

It is common to see that ad… Read the rest “Exchange Online Transport Rule Audit”

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Exchange Online App-Only Authentication Error AADSTS70011 Invalid Scope

Posted on 17th May 2021 by Rhoderick Milne [MSFT]

As more people are starting to use the Exchange Online V2 module (yay!), there are some new and different issues appearing.

In this case, the command to connect to the tenant was failing when App-Only authentication was used. A certificate was installed onto the machine where PowerShell was running.

The command used is shown followed by a glorious error.

Error Acquiring Token:
System.Exception:… Read the rest “Exchange Online App-Only Authentication Error AADSTS70011 Invalid Scope”

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TenantOrganizationConfig Required When Preparing Active Directory

Posted on 10th May 2021 by Rhoderick Milne [MSFT]

When running /PrepareSchema in an Exchange organisation with an existing Exchange Hybrid deployment you may run into an error which states:

"A hybrid deployment with Office 365 has been detected. Please ensure that you are running setup with the /TenantOrganizationConfig switch"

This is shown below:

A similar issue will occur if you specify only /PrepareAD

Note that the /TenantOrganizationConfig switc… Read the rest “TenantOrganizationConfig Required When Preparing Active Directory”

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Exchange HCW Detects “Wrong” Version

Posted on 2nd November 2020 by Rhoderick Milne [MSFT]

When running Exchange setup or the Exchange Hybrid Configuration Wizard (HCW), I always recommend looking at the version information that is shown on screen. This is part of the gross error check to make sure that the correct version is being used.

This habit is one of the recommendations made in the Mistakes to Avoid Installing Exchange CU post.

Sometime you still may see something that surprises yo… Read the rest “Exchange HCW Detects “Wrong” Version”

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Office 365 Welcome Pages – Circa 2015

Posted on 24th April 2020 by Rhoderick Milne [MSFT]

The below are some of the older Office 365 welcome pages, thought it might be fun to make the screenshots available for reference. They are from an old blog post that never made its way out of the draft folder. So it was repurposed for this post.

I used to call this one the California Highway

Once signed in, the Office 365 admin portal is shown below.

Cheers,

Rhoderick

&… Read the rest “Office 365 Welcome Pages – Circa 2015”