Windows 8.1 was released to the Windows Store last week and aside from having to download the same 3.9 GB update on each machine I've installed it on it's been a relatively easy and smooth update. I did, however, run into one small problem related to Oracle VirtualBox. When you install VirtualBox a "Host-Only" network adapter is installed in Windows to allow guest VMs to communicate with the Windows host, as the screenshot below shows:

Network Connections Window

Unfortunately the Windows 8.1 upgrade process deletes the network adapter. After the upgrade you'll be faced with a warning message in the VM properties window and your VM won't start.

VirtualBox VM Settings Window

The fix is easy - just reinstall VirtualBox. It's not a bad idea, actually, as at the same time as Windows 8.1 went live so did VirtualBox Version 4.3. The latest version has a few nice improvements that make it worth the upgrade, including: Multi-touch support, virtual USB webcam, a new NAT adapter that enables hosts and guests to communicate without requiring a host-only adapter, and the ability to record the entire VM session to video.

As always, if you upgrade VirtualBox it's a good idea to upgrade the guest additions as well.

About Kendal

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Kendal is a database strategist, community advocate, public speaker, and blogger. A practiced IT professional with over 15 years of SQL Server experience, Kendal excels at disaster recovery, high availability planning/implementation, & debugging/troubleshooting mission critical SQL Server environments. Kendal is a Senior Consultant on the Microsoft Premier Developer Support team and President of MagicPASS, the Orlando, FL based chapter of PASS. Before joining Microsoft, Kendal was a SQL Server/Data Platform MVP from 2011-2016.