Install Microsoft Sql Server Native Client

Well, it can be hard enough to find documentation that something doesn happen. It will be practically impossible to find documentation that installing client tools will not hurt your express instance.All you can really do is backup the data, and install. If you're worried about it, you'll have to setup the system in a test environment and try it.

1. Sql Server Native Client 10
2. Install Sql Server Native Client 11.0

I'm just telling you that I've installed it on machines with SQL express (BCM, from MS-Office includes SQL Express) as well as full blown SQL server and not had a problem. Well, it can be hard enough to find documentation that something doesn happen. It will be practically impossible to find documentation that installing client tools will not hurt your express instance.All you can really do is backup the data, and install.

Sql Server Native Client 10

Install Sql Server Native Client 11.0

If you're worried about it, you'll have to setup the system in a test environment and try it. I'm just telling you that I've installed it on machines with SQL express (BCM, from MS-Office includes SQL Express) as well as full blown SQL server and not had a problem.