Short Description: Setting for changing the week numbers
Per default the Lotus Notes Client use the OS standart for weeknumbers instead the ISO one. So it might happen that a Notes 8.5 calendar January 1st, 2010 claims to be in 'week 1'. However, according to the ISO standards this should be 'week 53' since week number 1 is the week with the first Thursday of the year and January 1st, 2010 is on a Friday.
You can change the setting for week numbering to 'Always use the ISO standard' displays the correct week number. You can find this setting under 'File --> Preferences --> Calendar and To Do --> Week Numbers'
Or you can modifize your notes.ini with these values:
0 = Custom Week Numbers
1 = Always use the OS standard
2 = Always use the ISO standard
file - preferences - calendar & todo - regional settings - weeknumbers