I was wondering why my MSN Messenger wouldn't logon today. Well apparently, I wasn't the only one experiencing an outage with MSN Messenger.

Microsoft confirmed today that a "significant" number of its MSN Messenger users have been experiencing intermittent outages for about a day.

Microsoft remained vague on the nature of the outage, blaming it on an "isolated issue that we've located in the data center," according to a company spokeswoman and would not elaborate on when service would be restored. Microsoft said the outage is affecting MSN Messenger users across many countries, but Microsoft would not disclose the number of users affected.

This latest outage comes just days after security monitors discovered the Bropia worm was using MSN Messenger to spread. The Microsoft spokeswoman denied the outage was caused by the worm.