Microsoft will release another series of critical software patches on Tuesday. There will be eight security alerts and patches affecting Windows, Office, MSN Messenger and Exchange.

Five of the security bulletins apply to Windows, at least one of which is critical. Office, MSN Messenger and Exchange, will get one bulletin each, all deemed critical, the software giant admitted.

Microsoft gave no further information, other than that some of the patches will require Windows to be restarted.

The software maker provides information in advance of its monthly patch release day, every second Tuesday of the month, so users can prepare. Last month, Microsoft did not release any patches, after a dozen security bulletins in February.

In addition to the patches, Microsoft will release an updated version of its Malicious Software Removal Tool and two "high priority" updates for Windows that are not related to security issues, the company said.