Category Archives: Exchange

Office 365 / Exchange: Stop Display Name Spoofing

Office 365

Display Name Spoofing / Impersonation is a simple but effective way hackers will try and obtain information, divert funds, and defraud you and your staff.

The hackers will look for executives within your company and then create valid email addresses with their display names on common mailing platforms, and then send requests through requesting funds transferred, bank details etc.

In a busy workplace with only a glance at the display name it would be easy to action these requests without further thought.

The problem is this type of spoofing uses valid email addresses from valid domains, but with the same display name as executives, so mechanisms like SPF, DKIM and DMARC won’t pick them up.

However, by implementing a simple mail-flow rule, you can easily add a warning to this type of message which should prompt the end use to proceed with caution.

Here’s how to set it up.

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Top 10 Blog posts of 2017

Happy New Year!

In 2017 the OxfordSBSGuy.com blog has gone from strength to strength, with 26 posts and 863,000 views. In 2017 I implemented SSL and been working on some tweaks here and there to improve performance.  This year I’m considering a redesign and new hosting is in the pipeline to improve performance further. Thank you for your support.

Below are the top ten articles in 2017

  1. PowerShell: Get-ADComputer to retrieve computer last logon date – part 1 (103,582 views)
  2. PowerShell: Get-ADUser to retrieve password last set and expiry information (83,394 views)
  3. Exchange PowerShell: How to list all SMTP email addresses in Exchange (63,442 views)
  4. How to convert a Hyper-V VHDX to VMDK for VMware Workstation (31,337 views)
  5. PowerShell: Get-ADUser to retrieve login scripts and home directories – Part 1 (31,017 views)
  6. How to install Exchange 2010 (SP3) on Windows Server 2012   (43,232 views)
  7. Server 2012: “Your current security settings do not allow this file to be downloaded” (29,374 views)
  8. Exchange PowerShell: How to enumerate Distribution Lists, managers and members (24,264 views)
  9. Dell PERC: How to clear the foreign configuration on a HDD using the Raid Configuration Utility (21,799 views)
  10. How to resolve VMware Workstation “The network bridge on device ‘VMnet0’ is not running” (21,737 views)

Looking forward to 2018, the industry recently has been focusing on security so I’ll be brushing up on some Security Skills with Sophos and WatchGuard, and with more and more clients moving to Office 365, I intend to write a few more PowerShell scripting to help manage end users and computers in the cloud.

I hope you have a great year!
Carl
www.OxfordSBSGuy.com

Office 365: How to change your Office 365 App Password

Office 365

If you use Multi Factor Authentication in an Office 365 environment then you will need to use App Passwords for some applications that don’t support Multi Factor Authentication like Outlook, or other email clients on mobile devices.

If you’ve forgotton your App Password or need to delete or create a new one, here is where to find them and how to create a new one.

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Exchange 2010 SP3 Update Rollup 18 installation tips

Microsoft Exchange 2010 SP3 Update Rollup 11 Installtion tips

Microsoft released the Exchange 2010 SP3 Update Rollup 18 on 6 July 2017.

I installed Update Rollup 18 on my test SBS 2011 server this morning and it took 11 minutes 30 seconds from start to finish, so I wouldn’t expect it to take much longer than this in production.

Please test before installing into your production environment. Maybe even wait a few days or a week or two from the release date to make sure the QA is up to scratch on it.

For migrations to Exchange 2016, Exchange 2010 SP3 Update Rollup 11 is the minimum version that will be supported in a coexistance environment.

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Office 365 PowerShell: How to bulk change Office 365 calendar permissions using Windows PowerShell

office365 powershell

I recently had to make some bulk changes to calendar permissions in Office 365, the client wanted the Default user permission to be set to Reviewer rather than AvailabilityOnly. So in this post I’ll walk you through how I went about making bulk permission changes to the Default user for the calendar folder for all users in Office 365.

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Exchange 2010 SP3 Update Rollup 17 installation tips

Microsoft Exchange 2010 SP3 Update Rollup 11 Installtion tips

Edit: Update Rollup 18 is now available for Exchange 2010 SP3 see the post Exchange 2010 SP3 Update Rollup 18 installation tips.

Microsoft released the Exchange 2010 SP3 Update Rollup 17 on 20 March 2017, so I’m a little late with this post, but i’m sure it will still be useful to you if you are reading it!

I installed Update Rollup 17 on my test SBS 2011 server this morning and it took 13 minutes from start to finish, so I wouldn’t expect it to take much longer than this in production.

Please test before installing into your production environment. Maybe even wait a few days or a week or two from the release date to make sure the QA is up to scratch on it.

For migrations to Exchange 2016, Exchange 2010 SP3 Update Rollup 11 is the minimum version that will be supported in a coexistance environment.

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Exchange 2010 SP3 Update Rollup 16 installation tips

Microsoft Exchange 2010 SP3 Update Rollup 11 Installtion tips

Edit: Update Rollup 18 is now available for Exchange 2010 SP3 see the post Exchange 2010 SP3 Update Rollup 18 installation tips.

Microsoft released the Exchange 2010 SP3 Update Rollup 16 on 13 December 2016.

I installed Update Rollup 16 on my test SBS 2011 server this evening and it took about 10 minutes from start to finish, so I wouldn’t expect it to take much longer than this in production.

Please test before installing into your production environment. Maybe even wait a few days or a week or two from the release date to make sure the QA is up to scratch on it.

For migrations to Exchange 2016, Exchange 2010 SP3 Update Rollup 11 is the minimum version that will be supported in a coexistance environment.

Continue reading