Not done any of them personally as learnt on the job (currently Infrastructure Manager for a uk charity).
All depends on what you want to do in the role. Enterprise Support Technician is very different to an Enterprise Admin role or Exchange admin
Also, Exchange 2007 is completely dead in the water. Most companies seem to have stuck with Exchange 2003 and are now making the jump directly to 2010. No point taking a qualification in something thats being phased out, so if you want to do the Exchange course make sure its 2010.
In terms of job prospects, hard to say really. A lot of companies have made experienced staff redundant over the past few years so you could be up against people who've been around longer. But you might get lucky and walk into the first job you apply for.
Personally if I was recruiting I would take more of an interest in your experience/role over the last 6 years, than of the course you had done. What sort of stuff are you doing now?
