You may have heard about ‘browse rank’ by Microsoft to compete with Google’s page rank.

Google’s Page rank is a calculation by considering many factors whereas browse rank has been calculated with two following points.

• How many peoples visits the page
• How long they stay in the page

Don’t panic, your ad performance and clicks won’t be affected. Just you cannot login to the account for four hours due to the Google’s site maintenance.

Here’s the start time in a few international cities: