We have a program that cannot import Layerfiles from 10.1, but instead changes them to 10.0 layer files. I'm wondering if there is any Layer functionality that is lost in this transition. Right now only a couple of people are using 10.1 in our organization and they have been saving their layer files as 10.0, no issues. But going forward if we all change to 10.1 will this automatic saving to a 10.0 version of a layer file lose anything that we would notice?
With the help of PolyGeo's prodding I found the answers I needed here:
Most of the differences are found when saving MXD's to previous versions, but there are a few things that I expect are lost when saving Layers from 10.0 to 10.1:
-Label expressions are converted to VBScript when saved from 10.1 to 10.0. Not sure if this would effect more complicated expressions. Maybe.
-The Maplex Label engine is default in 10.1, so the labeling in the saved layer will probably change when saved to 10.0. I don't know if turning the Maplex labeling engine on in 10.0 before bringing the Layer in would negate this effect.
-Layers that reference 10.1 geodatabases will not be able to connect to their datasource.