May 20 (Reuters) - Palo Alto Networks forecast fourth-quarter billings above Wall Street estimates on Monday, a sign that clients are turning to the cybersecurity firm for its integrated software security tools.

The company expects fourth-quarter billings to be between $3.43 billion and $3.48 billion, compared with analysts' average estimate of $3.45 billion, according to LSEG data.

(Reporting by Jaspreet Singh in Bengaluru; Editing by Alan Barona)