Microsoft today said it will patch at least 14 vulnerabilities next week, including four in Internet Explorer (IE), making it three months in a row that the company has plugged holes in its browser.

Of the nine updates set for Aug. 14, five will be labeled "critical," the most serious of the four ratings Microsoft uses. The other four will be pegged "important," the next-lower threat ranking.

The big story for next week will be the one-two punch of patches for Exchange and SQL Server.

"Those are two of the three things that are most important to IT in enterprises," said Andrew Storms, director of security operations at nCircle Security. "Thank goodness SharePoint's not included. But Microsoft is hitting two out of three in just one month."

In the advanced notification of next week's updates, Microsoft outlined patches for Exchange, the email server software used by most companies, and SQL Server, the database that runs many corporations' internal and external processes, including powering websites and providing workers with everything from business intelligence to financial information.

The problem with patching those systems -- Exchange and SQL Server -- is their criticality to business, said Storms.

"In most companies, security and operations are split into two groups," said Storms. "That sets up a classic conflict. Security cares about patching, operations cares about uptime."

Some firms deal with the conflict by running a lab where the security team can replicate the firm's production systems and use those for patch testing. Other companies rely on redundancy to prevent a company-wide failure of email and databases.

In any case, IT administrators like to go slowly when dealing with Exchange and SQL Server to ensure that updates don't cause unexpected downtime. "It could take some enterprises months to patch all their Exchange nodes," Storms said.