Care how you name your projects

A little oddity to share.  I am working on a series of engagements for a 
software distributor who trades with all of the large vendors.  My
projects 
are named "client.Biztalk.Vendors.vendorname.Orders"  My projects where
the 
vendorname is Symantec or McAfee etc. build without any problem.  My
project 
where the vendorname is Microsoft refuses to build and tells me I am
missing 
a reference.  After much frustration I suddenly thought to change the
vendor 
name to "MS" whereupon it built first time.  Using "Microsoft" in the
project 
name and thus in the generated default namespace clearly causes an issue.