I have Quicken 1999 running on Windows XP Pro. In 2009 I upgraded Quicken Deluxe 2009 on the same computer and was not able transfer the 1999 data to the 2009 version so I continued using Quicken 1999.
In June 2022 I moved and started the upgrade of Quicken to my computer running Windows 7 Pro. I learned that I would have to upgrade in stages, the 1st stage would be Quicken 2004.
I update one checking account to Quicken 2004 running on Windows 7 Pro. However I continued using Quicken 1999 until May 2023 when my data became corrupted and Quicken 1999 would not open.
While Quicken 1999 was down I wrote checks with Quicken 2004 and Windows 7. That left a gap in my register between June of 2022 and May 2023. I was able to reinstall Quicken 1999 and retrieve my lost register data (only about 75 items - If necessary i can enter the formerly lost data into Quicken 2004 by hand).
I have exported the formerly lost data from Quicken 1999 to a QIF file. I have not been able to merge lost QIF data with the QIF data in Quicken 2004. When I attempt to input the lost data into Quicken 2004 the message indicates the QIF file already exists. Is there a way to merge the data?