F5 Networks (FFIV) shares are lower today after UBS analyst Saud Masud cut his earnings estimates and price target for the company. Masud chopped his 2008 EPS estimate to 95 cents from $1. For ‘09, he goes to $1.27, from $1.40. His target is now $32, down from $44.

Masud says the company’s fourth quarter results should be in line with Street expectations of 21 cents a share. But he says that given the “challenging market environment,” especially in the financial and technology sectors “it is likely that IT spending decisions within key verticals may see some delays and pushouts in ‘08.” He says checks find January is off to a slower start, and that IT networking budgets may be flat to down 15% in the first half, possibly stabilizing in the second half.

Masud maintains his Buy rating on the shares, and says that with $475 million in cash, the company could consider buying back shares.

F5 today is down 33 cents, or 1.6%, at $20.35.