We often get questions around Microsoft Project Specifications and limits. This helpful information was provided by MSFT. Thanks.
The following specifications are supported when you run Microsoft Office Project 2007 or Microsoft Project 2010 on Microsoft Windows XP Service Pack 2, Windows Vista, or Windows 7, although actual limits and performance speed depend on your computer’s configuration.
Note Out-of-memory errors may occur before you reach the listed limits.
Attribute Maximum Resources per project 700,000 Resource units per assignment 60,000,000 units or 6,000,000,000% Resource availability dates 100 Tasks per project 400,000 Task dependencies per project No limit Predecessors per task 50,000 Successors per task 50,000 Outline levels per project 65,535 Consolidated projects 998 Open project files per consolidated project 998 Sharer files connected to a single resource pool
(That is, the maximum number of open project files, minus 1 for the resource pool itself.)
Open windows 50 Base calendars Tested to 30,000+ Calendar exceptions per calendar Testing was able to add more than 15,000 exceptions to a base calendar. Rate tables to support varying pay scales and rates 5 per resource Variable rates per rate table to support rate increases and decreases 25 Cost value in a currency field 999,999,999,999.99 Work value 1,666,666,666 hours Assignment work values for work assignments 999,999,999 hours Assignment work values for variable material assignments 999,999,999 units Assignment work values for fixed material assignments 60,000,000 units Custom cell formats 64,000 Print scaling adjustment range percentage 10%-500% Page header text 5 lines Page footer text 3 lines Page legend text 3 lines Page legend text box width 5 inches (12.7 centimeters) Filter tests per filter 40 Filter tests per AutoFilter 2 per column Earliest date allowed for calculation January 1, 1984 Latest date allowed for calculation December 31, 2049 Discontinuous selections in a sheet view 10 Baselines 11 Characters in a text field 255 Characters in an outline code field 255 Values and characters in an Enterprise Resource Multi-Value (ERMV) field 255 values, each of 255 characters Value in a number field 9,999,999,999,999.99