I added my Christmas Tree to my blank room model both as an appended file and as a linked file. I did this because yesterday when I linked the files none of the textures or the particle system came over but when I appended the file textures and the particle system rendered just fine. Today I tried an experiment and created files using both techniques, rendered the results and was going to post here showing what was happening but to my surprise everything work in both cases as you can see below. I don’t know what I did wrong before but I will use the append method saving file space for the final blend.

Image using the Append method

Image using the Link method