INTRODUCTION
Sharepoint VNext 2010 is coming up so I have to make sure that CompleteSharepoint.NET – the content management system built on top of WSS 3.0 (http://www.completesharepoint.net) – is compatible.
So I run stsadm -o preupgradecheck and below is the results:

Luckily CS.NET is vNext 2010 compatible! WOOHOO! Please note though that I ran this on a Windows Server 2008 x64 bit environment. Sharepoint vNext 2010 only works on a x64 bit environment and to be precise, it can only run on IIS version 7 onwards. Windows Server 2003 will not be supported.
Your SQL Server has to be x64 bit as well. It has to be SQL 2005 onwards.
Below is the results from the HTML report:
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| Information Only : Supported upgrade types |
The current farm supports the following upgrade types:
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There are other text in the report which I haven't included in this article but the main thing is, I didn't get any error message in the report. Some of the elements (such as custom field types) won't be upgraded automatically (ie. need to be upgraded manually).
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Therefore, if you have used CompleteSharepoint.NET for your client website you'll be able to upgrade to the next version of Sharepoint when it arrives.
I'll keep you posted about the upgrade process.
Cheers and please stay tuned,
Tommy
