SQL-89 versus SQL-90 JOIN Syntax - What's the Difference???

What's the advantage of using the "JOIN" syntax when joining SQL tables???

I work in a mixed environment where we use both SQL Servers and Sybase Servers.

All of the SQL Server developers write their joins using the SQL-92 syntax like this:

    SELECT c.name, a.state FROM 
        Customers c JOIN Address a ON c.CustomerId = a.CustomerId

But all of the Sybase developers continue to write their joins using the SQL-89 syntax like this:

    SELECT c.name, a.state FROM Customers c, Address a
        WHERE c.CustomerId = a.CustomerId

I don't see much difference on these smaller queries, but I always get frustrated trying to read the SQL-89 syntax on larger queries.  What's the difference and why do developers still use SQL-89 syntax???

Unable to create the virtual directory. The URL ... is already mapped to a different folder

I setup my web project to run locally using IIS Express.  It worked for a while, but eventually I started getting the following error:

Unable to create the virtual directory. The URL ... is already mapped to a different folder

I wasn't quite sure what I'd changed to cause this to start happening.  I'd get this error when I was opening my solution.  My web project wouldn't even load.  I had to edit the csproj file manually and change my project to use "localhost".

This would allow my project file to open, but it wouldn't solve the problem.  When I changed it back from LocalHost it would just break again.

SOLUTION:

I found that my IISExpress had been cluttered up by past configurations and projects.  I had to clean up my applicationhost.config file, which is located here:

<UserProfile>\Documents\IISExpress\config

I just searched this file for my project folder path and removed sites that referenced that same path.  Once I did that, I could change my project back to something other than LocalHost and everything worked fine.

dbmdl could not be created, Internal Error: Ese could not be initialized

Lately I've been getting the error "DBMDL file could not be created, it might be locked by another application ... DBMDL file could not be created, it might be locked by another application" when opening database projects in Visual Studio 2013.