After a lot of false starts I finally updated this site to the latest version of DasBlog. I had been running the older version that was distributed as an ASP.Net 1.1 application. I had converted the old 1.1 source to compile under 2.0 and had used this configuration for about three years.
The biggest challenge was to convert the existing data files to work with the version. The DasBlog distribution comes with a conversion utility. This worked fairly well, but seems to trip up on some imbedded HTML in some of the posts. About four or five posts ended up with two copies in the new system. I simply published the converted files and then deleted the duplicates.
Once the new system was operating the old permalinks were no longer working. I have a few posts that I was frequently getting referral notices by Google from the system. It took two or three weeks for Google to notice the changes, but they did offer a cached version of the old page in the interim.