Hi Robert, according to Excel 2000 specifications, the number of worksheets has no set limit, it is limited by the available memory on your comnputer, so this will depend also on what's in the worksheets (amount of formulas, data and formatting). The number of open workbooks is also limited by available memory. Wilson At 00:24 24/9/2005,Robert Carneal wrote: >Is there a way to determine ahead of time the maximum of worksheets allowed >in one workbook ahead of time? This project I have begin is starting to look >like it will involve 86 or 87 sheets. Will Excel go that high? ************************************************************* You are receiving this mail because you subscribed to mso@xxxxxxxxxxxxx or MicrosoftOffice@xxxxxxxxxxxxxxxx To send mail to the group, simply address it to mso@xxxxxxxxxxxxx To Unsubscribe from this group, send an email to mso-request@xxxxxxxxxxxxx with the word "unsubscribe" (without the quotes) in the subject line. Or, visit the group's homepage and use the dropdown menu. This will also allow you to change your email settings to digest or vacation (no mail). //www.freelists.org/webpage/mso To be able to use the files section for sharing files with the group, send a request to mso-moderators@xxxxxxxxxxxxx and you will be sent an invitation with instructions. Once you are a member of the files group, you can go here to upload/download files: http://www.smartgroups.com/vault/msofiles *************************************************************