Python (Win) Database Advice needed

[Ian Clarke]

Hi, I am planning to write a python based web-database retrieval system.  I
am not very familiar with databases in general (although I have used SQL)
and was looking for some advice.  Basically this system will run on an NT
server and allow selected users to view and change data over the web.  I
need a mechanism for storing the data so that:
1) It can be accessed by several HTTP threads running at the same time
without risk of corruption
2) It can be migrated to other database formats such as Microsoft Access.
3) It is Open Source
4) It is simple to deploy

Thanks for any advice,

Ian.