This is a view of the Eastern End of the Abbaye. According to John James on his blog, Preuilly had the "first great rose window - 1160s" but I think this must refer to another Preuilly - certainly there is no evidence of a rose window in the Abbaye in Preuilly-sur-Claise. If there was you would be able to see it in this pic.
The Abbaye was founded in the year 1001, and in 1012 a monastry was founded. The date over the door is 1009 (the year of consecration) and the 900th year anniversary of the Abbaye was celebrated in 1909. This means the 1000th birthday of the building will be celebrated in 2009. I wonder if they will have cake?