Your credit history from the morgage will increase your credit score but…

The way it works is your net worth. If you owe money to a bank (etc) you are in the negative. That means your ability to pay for other, debts is greatly reduced, especially on a homeloan. Your house can be held as equity if you own it yourself. The way they figure, the more money you owe then the less able you are to pay back, there for they will offer you less credit. It doesn’t lower you score, but it does effect the credit you are offered over all.

-50,000 Home
-10,000 Car
+1,000 savings
equals 59,000 you are in debt

No matter how good you score is, what you owe does effect your purchase power (credit limit). You income and savings are also a factor in some cases, given a large quantity of either.

bolderdash! so long as you paid your note on time, everything works in your favor. believe me, a purchase as big as a house, with a long term mortgage, is going to show up for quite some time as a very fine indicator of your credit capabilities!