SEATTLE – Microsoft released 12 security bulletins Tuesday that address both Windows and Office issues.

Ten Windows bulletins were released for Windows and two for Office as part of Microsoft’s monthly patching schedule. At least one update for each product is considered critical and some will require a restart, Microsoft said in a notice posted on its Web site that was reported by CNET News.Com.

Last month after Microsoft released its monthly batch of patches, exploits for flaws in its PowerPoint presentation software were released on the Web. Tuesday’s patches were fixes for those issues, but Wednesday might signal the release of other exploits for flaws the company has yet to patch.

On the Windows front, security companies recently noticed a variant of an exploit for a flaw that Microsoft had previously patched, and Tuesday’s updates could also contain patches that address that variant.

Microsoft will hold a Webcast Wednesday to answer customer questions about the latest cycle of patches.